diff --git a/.env.example b/.env.example
index 81ce928..a4eae50 100644
--- a/.env.example
+++ b/.env.example
@@ -5,6 +5,9 @@ APP_KEY=
 APP_DEBUG=true
 APP_URL=http://localhost
 
+# Multi-tenancy 設定 (用逗號分隔多個中央網域)
+CENTRAL_DOMAINS=localhost,127.0.0.1
+
 APP_LOCALE=en
 APP_FALLBACK_LOCALE=en
 APP_FAKER_LOCALE=en_US
diff --git a/app/Console/Commands/MigrateToTenant.php b/app/Console/Commands/MigrateToTenant.php
new file mode 100644
index 0000000..0f1f0fd
--- /dev/null
+++ b/app/Console/Commands/MigrateToTenant.php
@@ -0,0 +1,131 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Models\Tenant;
+use Illuminate\Console\Command;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * 將現有資料遷移到租戶資料庫
+ * 
+ * 此指令用於初次設定多租戶時，將現有的 ERP 資料遷移到第一個租戶
+ */
+class MigrateToTenant extends Command
+{
+    protected $signature = 'tenancy:migrate-data {tenant_id} {--dry-run : 只顯示會遷移的表，不實際執行}';
+    protected $description = '將現有 central DB 資料遷移到指定租戶資料庫';
+
+    /**
+     * 需要遷移的表 (依賴順序排列)
+     */
+    protected array $tablesToMigrate = [
+        'users',
+        'password_reset_tokens',
+        'sessions',
+        'cache',
+        'cache_locks',
+        'jobs',
+        'job_batches',
+        'failed_jobs',
+        'categories',
+        'units',
+        'vendors',
+        'products',
+        'product_vendor',
+        'warehouses',
+        'inventories',
+        'inventory_transactions',
+        'purchase_orders',
+        'purchase_order_items',
+        'permissions',
+        'roles',
+        'model_has_permissions',
+        'model_has_roles',
+        'role_has_permissions',
+    ];
+
+    public function handle(): int
+    {
+        $tenantId = $this->argument('tenant_id');
+        $dryRun = $this->option('dry-run');
+
+        // 檢查租戶是否存在
+        $tenant = Tenant::find($tenantId);
+        if (!$tenant) {
+            $this->error("租戶 '{$tenantId}' 不存在！請先建立租戶。");
+            return self::FAILURE;
+        }
+
+        $this->info("開始遷移資料到租戶: {$tenantId}");
+        $this->info("租戶資料庫: tenant{$tenantId}");
+
+        if ($dryRun) {
+            $this->warn('⚠️  Dry Run 模式 - 不會實際遷移資料');
+        }
+
+        // 取得 central 資料庫連線
+        $centralConnection = config('database.default');
+        $tenantDbName = 'tenant' . $tenantId;
+
+        foreach ($this->tablesToMigrate as $table) {
+            // 檢查表是否存在於 central
+            if (!Schema::connection($centralConnection)->hasTable($table)) {
+                $this->line("  ⏭️  跳過 {$table} (表不存在)");
+                continue;
+            }
+
+            // 計算資料筆數
+            $count = DB::connection($centralConnection)->table($table)->count();
+            if ($count === 0) {
+                $this->line("  ⏭️  跳過 {$table} (無資料)");
+                continue;
+            }
+
+            if ($dryRun) {
+                $this->info("  📋 {$table}: {$count} 筆資料");
+                continue;
+            }
+
+            // 實際遷移資料
+            $this->info("  🔄 遷移 {$table}: {$count} 筆資料...");
+
+            try {
+                // 使用租戶上下文執行
+                $tenant->run(function () use ($centralConnection, $table) {
+                    // 取得 central 資料
+                    $data = DB::connection($centralConnection)->table($table)->get();
+                    
+                    if ($data->isEmpty()) {
+                        return;
+                    }
+
+                    // 關閉外鍵檢查
+                    DB::statement('SET FOREIGN_KEY_CHECKS=0');
+                    
+                    // 清空目標表
+                    DB::table($table)->truncate();
+                    
+                    // 分批插入 (每批 100 筆)
+                    foreach ($data->chunk(100) as $chunk) {
+                        DB::table($table)->insert($chunk->map(fn($item) => (array) $item)->toArray());
+                    }
+                    
+                    // 恢復外鍵檢查
+                    DB::statement('SET FOREIGN_KEY_CHECKS=1');
+                });
+
+                $this->info("  ✅ {$table} 遷移完成");
+            } catch (\Exception $e) {
+                $this->error("  ❌ {$table} 遷移失敗: " . $e->getMessage());
+                return self::FAILURE;
+            }
+        }
+
+        $this->newLine();
+        $this->info('🎉 資料遷移完成！');
+        
+        return self::SUCCESS;
+    }
+}
diff --git a/app/Http/Controllers/Landlord/DashboardController.php b/app/Http/Controllers/Landlord/DashboardController.php
new file mode 100644
index 0000000..82680d1
--- /dev/null
+++ b/app/Http/Controllers/Landlord/DashboardController.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Http\Controllers\Landlord;
+
+use App\Http\Controllers\Controller;
+use App\Models\Tenant;
+use Inertia\Inertia;
+
+class DashboardController extends Controller
+{
+    public function index()
+    {
+        $stats = [
+            'totalTenants' => Tenant::count(),
+            'activeTenants' => Tenant::whereJsonContains('data->is_active', true)->count(),
+            'recentTenants' => Tenant::latest()->take(5)->get()->map(function ($tenant) {
+                return [
+                    'id' => $tenant->id,
+                    'name' => $tenant->name ?? $tenant->id,
+                    'is_active' => $tenant->is_active ?? true,
+                    'created_at' => $tenant->created_at->format('Y-m-d H:i'),
+                    'domains' => $tenant->domains->pluck('domain')->toArray(),
+                ];
+            }),
+        ];
+
+        return Inertia::render('Landlord/Dashboard', $stats);
+    }
+}
diff --git a/app/Http/Controllers/Landlord/TenantController.php b/app/Http/Controllers/Landlord/TenantController.php
new file mode 100644
index 0000000..98ad551
--- /dev/null
+++ b/app/Http/Controllers/Landlord/TenantController.php
@@ -0,0 +1,172 @@
+<?php
+
+namespace App\Http\Controllers\Landlord;
+
+use App\Http\Controllers\Controller;
+use App\Models\Tenant;
+use Illuminate\Http\Request;
+use Illuminate\Validation\Rule;
+use Inertia\Inertia;
+
+class TenantController extends Controller
+{
+    /**
+     * 顯示租戶列表
+     */
+    public function index()
+    {
+        $tenants = Tenant::with('domains')->get()->map(function ($tenant) {
+            return [
+                'id' => $tenant->id,
+                'name' => $tenant->name ?? $tenant->id,
+                'email' => $tenant->email ?? null,
+                'is_active' => $tenant->is_active ?? true,
+                'created_at' => $tenant->created_at->format('Y-m-d H:i'),
+                'domains' => $tenant->domains->pluck('domain')->toArray(),
+            ];
+        });
+
+        return Inertia::render('Landlord/Tenant/Index', [
+            'tenants' => $tenants,
+        ]);
+    }
+
+    /**
+     * 顯示新增租戶表單
+     */
+    public function create()
+    {
+        return Inertia::render('Landlord/Tenant/Create');
+    }
+
+    /**
+     * 儲存新租戶
+     */
+    public function store(Request $request)
+    {
+        $validated = $request->validate([
+            'id' => ['required', 'string', 'max:50', 'alpha_dash', Rule::unique('tenants', 'id')],
+            'name' => ['required', 'string', 'max:100'],
+            'email' => ['nullable', 'email', 'max:100'],
+            'domain' => ['nullable', 'string', 'max:100'],
+        ]);
+
+        $tenant = Tenant::create([
+            'id' => $validated['id'],
+            'name' => $validated['name'],
+            'email' => $validated['email'] ?? null,
+            'is_active' => true,
+        ]);
+
+        // 如果有指定域名，則綁定
+        if (!empty($validated['domain'])) {
+            $tenant->domains()->create(['domain' => $validated['domain']]);
+        }
+
+        return redirect()->route('landlord.tenants.index')
+            ->with('success', "租戶 {$validated['name']} 建立成功！");
+    }
+
+    /**
+     * 顯示單一租戶詳情
+     */
+    public function show(string $id)
+    {
+        $tenant = Tenant::with('domains')->findOrFail($id);
+
+        return Inertia::render('Landlord/Tenant/Show', [
+            'tenant' => [
+                'id' => $tenant->id,
+                'name' => $tenant->name ?? $tenant->id,
+                'email' => $tenant->email ?? null,
+                'is_active' => $tenant->is_active ?? true,
+                'created_at' => $tenant->created_at->format('Y-m-d H:i'),
+                'updated_at' => $tenant->updated_at->format('Y-m-d H:i'),
+                'domains' => $tenant->domains->map(fn($d) => [
+                    'id' => $d->id,
+                    'domain' => $d->domain,
+                ])->toArray(),
+            ],
+        ]);
+    }
+
+    /**
+     * 顯示編輯租戶表單
+     */
+    public function edit(string $id)
+    {
+        $tenant = Tenant::findOrFail($id);
+
+        return Inertia::render('Landlord/Tenant/Edit', [
+            'tenant' => [
+                'id' => $tenant->id,
+                'name' => $tenant->name ?? $tenant->id,
+                'email' => $tenant->email ?? null,
+                'is_active' => $tenant->is_active ?? true,
+            ],
+        ]);
+    }
+
+    /**
+     * 更新租戶
+     */
+    public function update(Request $request, string $id)
+    {
+        $tenant = Tenant::findOrFail($id);
+
+        $validated = $request->validate([
+            'name' => ['required', 'string', 'max:100'],
+            'email' => ['nullable', 'email', 'max:100'],
+            'is_active' => ['boolean'],
+        ]);
+
+        $tenant->update($validated);
+
+        return redirect()->route('landlord.tenants.index')
+            ->with('success', "租戶 {$validated['name']} 更新成功！");
+    }
+
+    /**
+     * 刪除租戶
+     */
+    public function destroy(string $id)
+    {
+        $tenant = Tenant::findOrFail($id);
+        $name = $tenant->name ?? $id;
+        
+        $tenant->delete();
+
+        return redirect()->route('landlord.tenants.index')
+            ->with('success', "租戶 {$name} 已刪除！");
+    }
+
+    /**
+     * 新增域名到租戶
+     */
+    public function addDomain(Request $request, string $id)
+    {
+        $tenant = Tenant::findOrFail($id);
+
+        $validated = $request->validate([
+            'domain' => ['required', 'string', 'max:100', Rule::unique('domains', 'domain')],
+        ]);
+
+        $tenant->domains()->create(['domain' => $validated['domain']]);
+
+        return back()->with('success', "域名 {$validated['domain']} 已綁定！");
+    }
+
+    /**
+     * 移除租戶的域名
+     */
+    public function removeDomain(string $id, int $domainId)
+    {
+        $tenant = Tenant::findOrFail($id);
+        $domain = $tenant->domains()->findOrFail($domainId);
+        $domainName = $domain->domain;
+
+        $domain->delete();
+
+        return back()->with('success', "域名 {$domainName} 已移除！");
+    }
+}
diff --git a/app/Models/Tenant.php b/app/Models/Tenant.php
new file mode 100644
index 0000000..09d7601
--- /dev/null
+++ b/app/Models/Tenant.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Models;
+
+use Stancl\Tenancy\Database\Models\Tenant as BaseTenant;
+use Stancl\Tenancy\Contracts\TenantWithDatabase;
+use Stancl\Tenancy\Database\Concerns\HasDatabase;
+use Stancl\Tenancy\Database\Concerns\HasDomains;
+
+/**
+ * 租戶 Model
+ * 
+ * 代表 ERP 系統中的每一個客戶公司 (如：小小冰室、酒水客戶等)
+ * 
+ * 自訂屬性 (存在 data JSON 欄位中，可透過 $tenant->name 存取):
+ * - name: 租戶名稱 (如: 小小冰室)
+ * - email: 聯絡信箱
+ * - is_active: 是否啟用
+ */
+class Tenant extends BaseTenant implements TenantWithDatabase
+{
+    use HasDatabase, HasDomains;
+
+    /**
+     * 定義獨立欄位 (非 data JSON)
+     * 只有 id 是獨立欄位，其他自訂屬性都存在 data JSON 中
+     */
+    public static function getCustomColumns(): array
+    {
+        return [
+            'id',
+        ];
+    }
+}
diff --git a/app/Providers/AppServiceProvider.php b/app/Providers/AppServiceProvider.php
index 1d2694d..641a050 100644
--- a/app/Providers/AppServiceProvider.php
+++ b/app/Providers/AppServiceProvider.php
@@ -4,6 +4,7 @@ namespace App\Providers;
 
 use Illuminate\Support\ServiceProvider;
 use Illuminate\Support\Facades\URL;
+use Illuminate\Support\Facades\Route;
 
 class AppServiceProvider extends ServiceProvider
 {
@@ -26,5 +27,13 @@ class AppServiceProvider extends ServiceProvider
         \Illuminate\Support\Facades\Gate::before(function ($user, $ability) {
             return $user->hasRole('super-admin') ? true : null;
         });
+
+        // 載入房東後台路由 (只在 central domain 可用)
+        $this->app->booted(function () {
+            if (file_exists(base_path('routes/landlord.php'))) {
+                Route::middleware('web')->group(base_path('routes/landlord.php'));
+            }
+        });
     }
 }
+
diff --git a/app/Providers/TenancyServiceProvider.php b/app/Providers/TenancyServiceProvider.php
new file mode 100644
index 0000000..d94703c
--- /dev/null
+++ b/app/Providers/TenancyServiceProvider.php
@@ -0,0 +1,148 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Providers;
+
+use Illuminate\Support\Facades\Event;
+use Illuminate\Support\Facades\Route;
+use Illuminate\Support\ServiceProvider;
+use Stancl\JobPipeline\JobPipeline;
+use Stancl\Tenancy\Events;
+use Stancl\Tenancy\Jobs;
+use Stancl\Tenancy\Listeners;
+use Stancl\Tenancy\Middleware;
+
+class TenancyServiceProvider extends ServiceProvider
+{
+    // By default, no namespace is used to support the callable array syntax.
+    public static string $controllerNamespace = '';
+
+    public function events()
+    {
+        return [
+            // Tenant events
+            Events\CreatingTenant::class => [],
+            Events\TenantCreated::class => [
+                JobPipeline::make([
+                    Jobs\CreateDatabase::class,
+                    Jobs\MigrateDatabase::class,
+                    // Jobs\SeedDatabase::class,
+
+                    // Your own jobs to prepare the tenant.
+                    // Provision API keys, create S3 buckets, anything you want!
+
+                ])->send(function (Events\TenantCreated $event) {
+                    return $event->tenant;
+                })->shouldBeQueued(false), // `false` by default, but you probably want to make this `true` for production.
+            ],
+            Events\SavingTenant::class => [],
+            Events\TenantSaved::class => [],
+            Events\UpdatingTenant::class => [],
+            Events\TenantUpdated::class => [],
+            Events\DeletingTenant::class => [],
+            Events\TenantDeleted::class => [
+                JobPipeline::make([
+                    Jobs\DeleteDatabase::class,
+                ])->send(function (Events\TenantDeleted $event) {
+                    return $event->tenant;
+                })->shouldBeQueued(false), // `false` by default, but you probably want to make this `true` for production.
+            ],
+
+            // Domain events
+            Events\CreatingDomain::class => [],
+            Events\DomainCreated::class => [],
+            Events\SavingDomain::class => [],
+            Events\DomainSaved::class => [],
+            Events\UpdatingDomain::class => [],
+            Events\DomainUpdated::class => [],
+            Events\DeletingDomain::class => [],
+            Events\DomainDeleted::class => [],
+
+            // Database events
+            Events\DatabaseCreated::class => [],
+            Events\DatabaseMigrated::class => [],
+            Events\DatabaseSeeded::class => [],
+            Events\DatabaseRolledBack::class => [],
+            Events\DatabaseDeleted::class => [],
+
+            // Tenancy events
+            Events\InitializingTenancy::class => [],
+            Events\TenancyInitialized::class => [
+                Listeners\BootstrapTenancy::class,
+            ],
+
+            Events\EndingTenancy::class => [],
+            Events\TenancyEnded::class => [
+                Listeners\RevertToCentralContext::class,
+            ],
+
+            Events\BootstrappingTenancy::class => [],
+            Events\TenancyBootstrapped::class => [],
+            Events\RevertingToCentralContext::class => [],
+            Events\RevertedToCentralContext::class => [],
+
+            // Resource syncing
+            Events\SyncedResourceSaved::class => [
+                Listeners\UpdateSyncedResource::class,
+            ],
+
+            // Fired only when a synced resource is changed in a different DB than the origin DB (to avoid infinite loops)
+            Events\SyncedResourceChangedInForeignDatabase::class => [],
+        ];
+    }
+
+    public function register()
+    {
+        //
+    }
+
+    public function boot()
+    {
+        $this->bootEvents();
+        $this->mapRoutes();
+
+        $this->makeTenancyMiddlewareHighestPriority();
+    }
+
+    protected function bootEvents()
+    {
+        foreach ($this->events() as $event => $listeners) {
+            foreach ($listeners as $listener) {
+                if ($listener instanceof JobPipeline) {
+                    $listener = $listener->toListener();
+                }
+
+                Event::listen($event, $listener);
+            }
+        }
+    }
+
+    protected function mapRoutes()
+    {
+        $this->app->booted(function () {
+            if (file_exists(base_path('routes/tenant.php'))) {
+                Route::namespace(static::$controllerNamespace)
+                    ->group(base_path('routes/tenant.php'));
+            }
+        });
+    }
+
+    protected function makeTenancyMiddlewareHighestPriority()
+    {
+        $tenancyMiddleware = [
+            // Even higher priority than the initialization middleware
+            Middleware\PreventAccessFromCentralDomains::class,
+
+            Middleware\InitializeTenancyByDomain::class,
+            Middleware\InitializeTenancyBySubdomain::class,
+            Middleware\InitializeTenancyByDomainOrSubdomain::class,
+            Middleware\InitializeTenancyByPath::class,
+            Middleware\InitializeTenancyByRequestData::class,
+        ];
+
+        foreach (array_reverse($tenancyMiddleware) as $middleware) {
+            $this->app[\Illuminate\Contracts\Http\Kernel::class]->prependToMiddlewarePriority($middleware);
+        }
+    }
+}
diff --git a/bootstrap/providers.php b/bootstrap/providers.php
index 38b258d..c6a4f12 100644
--- a/bootstrap/providers.php
+++ b/bootstrap/providers.php
@@ -2,4 +2,5 @@
 
 return [
     App\Providers\AppServiceProvider::class,
+    App\Providers\TenancyServiceProvider::class,
 ];
diff --git a/composer.json b/composer.json
index e3ca062..b04034e 100644
--- a/composer.json
+++ b/composer.json
@@ -14,6 +14,7 @@
         "laravel/framework": "^12.0",
         "laravel/tinker": "^2.10.1",
         "spatie/laravel-permission": "^6.24",
+        "stancl/tenancy": "^3.9",
         "tightenco/ziggy": "^2.6"
     },
     "require-dev": {
diff --git a/composer.lock b/composer.lock
index fe204f0..2c30e85 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "edfbf8e1cc43c925ea8b04fc1f93da65",
+    "content-hash": "931b01f076d9ee28568cd36f178a0c04",
     "packages": [
         {
             "name": "brick/math",
@@ -508,6 +508,59 @@
             ],
             "time": "2025-03-06T22:45:56+00:00"
         },
+        {
+            "name": "facade/ignition-contracts",
+            "version": "1.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/facade/ignition-contracts.git",
+                "reference": "3c921a1cdba35b68a7f0ccffc6dffc1995b18267"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/facade/ignition-contracts/zipball/3c921a1cdba35b68a7f0ccffc6dffc1995b18267",
+                "reference": "3c921a1cdba35b68a7f0ccffc6dffc1995b18267",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.3|^8.0"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "^v2.15.8",
+                "phpunit/phpunit": "^9.3.11",
+                "vimeo/psalm": "^3.17.1"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Facade\\IgnitionContracts\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Freek Van der Herten",
+                    "email": "freek@spatie.be",
+                    "homepage": "https://flareapp.io",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Solution contracts for Ignition",
+            "homepage": "https://github.com/facade/ignition-contracts",
+            "keywords": [
+                "contracts",
+                "flare",
+                "ignition"
+            ],
+            "support": {
+                "issues": "https://github.com/facade/ignition-contracts/issues",
+                "source": "https://github.com/facade/ignition-contracts/tree/1.0.2"
+            },
+            "time": "2020-10-16T08:27:54+00:00"
+        },
         {
             "name": "fruitcake/php-cors",
             "version": "v1.4.0",
@@ -3443,6 +3496,179 @@
             ],
             "time": "2025-12-13T21:45:21+00:00"
         },
+        {
+            "name": "stancl/jobpipeline",
+            "version": "v1.8.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/archtechx/jobpipeline.git",
+                "reference": "c4ba5ef04c99176eb000abb05fc81fb0f44f5d9c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/archtechx/jobpipeline/zipball/c4ba5ef04c99176eb000abb05fc81fb0f44f5d9c",
+                "reference": "c4ba5ef04c99176eb000abb05fc81fb0f44f5d9c",
+                "shasum": ""
+            },
+            "require": {
+                "illuminate/support": "^10.0|^11.0|^12.0",
+                "php": "^8.0"
+            },
+            "require-dev": {
+                "ext-redis": "*",
+                "orchestra/testbench": "^8.0|^9.0|^10.0",
+                "spatie/valuestore": "^1.2"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Stancl\\JobPipeline\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Samuel Štancl",
+                    "email": "samuel.stancl@gmail.com"
+                }
+            ],
+            "description": "Turn any series of jobs into Laravel listeners.",
+            "support": {
+                "issues": "https://github.com/archtechx/jobpipeline/issues",
+                "source": "https://github.com/archtechx/jobpipeline/tree/v1.8.1"
+            },
+            "time": "2025-07-29T20:21:17+00:00"
+        },
+        {
+            "name": "stancl/tenancy",
+            "version": "v3.9.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/archtechx/tenancy.git",
+                "reference": "d98a170fbd2e114604bfec3bc6267a3d6e02dec1"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/archtechx/tenancy/zipball/d98a170fbd2e114604bfec3bc6267a3d6e02dec1",
+                "reference": "d98a170fbd2e114604bfec3bc6267a3d6e02dec1",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "facade/ignition-contracts": "^1.0.2",
+                "illuminate/support": "^10.0|^11.0|^12.0",
+                "php": "^8.0",
+                "ramsey/uuid": "^4.7.3",
+                "stancl/jobpipeline": "^1.8.0",
+                "stancl/virtualcolumn": "^1.5.0"
+            },
+            "require-dev": {
+                "doctrine/dbal": "^3.6.0",
+                "laravel/framework": "^10.0|^11.0|^12.0",
+                "league/flysystem-aws-s3-v3": "^3.12.2",
+                "orchestra/testbench": "^8.0|^9.0|^10.0",
+                "spatie/valuestore": "^1.3.2"
+            },
+            "type": "library",
+            "extra": {
+                "laravel": {
+                    "aliases": {
+                        "Tenancy": "Stancl\\Tenancy\\Facades\\Tenancy",
+                        "GlobalCache": "Stancl\\Tenancy\\Facades\\GlobalCache"
+                    },
+                    "providers": [
+                        "Stancl\\Tenancy\\TenancyServiceProvider"
+                    ]
+                }
+            },
+            "autoload": {
+                "files": [
+                    "src/helpers.php"
+                ],
+                "psr-4": {
+                    "Stancl\\Tenancy\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Samuel Štancl",
+                    "email": "samuel.stancl@gmail.com"
+                }
+            ],
+            "description": "Automatic multi-tenancy for your Laravel application.",
+            "keywords": [
+                "laravel",
+                "multi-database",
+                "multi-tenancy",
+                "tenancy"
+            ],
+            "support": {
+                "issues": "https://github.com/archtechx/tenancy/issues",
+                "source": "https://github.com/archtechx/tenancy/tree/v3.9.1"
+            },
+            "funding": [
+                {
+                    "url": "https://tenancyforlaravel.com/donate",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/stancl",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-03-13T16:02:11+00:00"
+        },
+        {
+            "name": "stancl/virtualcolumn",
+            "version": "v1.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/archtechx/virtualcolumn.git",
+                "reference": "75718edcfeeb19abc1970f5395043f7d43cce5bc"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/archtechx/virtualcolumn/zipball/75718edcfeeb19abc1970f5395043f7d43cce5bc",
+                "reference": "75718edcfeeb19abc1970f5395043f7d43cce5bc",
+                "shasum": ""
+            },
+            "require": {
+                "illuminate/database": ">=10.0",
+                "illuminate/support": ">=10.0"
+            },
+            "require-dev": {
+                "orchestra/testbench": ">=8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Stancl\\VirtualColumn\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Samuel Štancl",
+                    "email": "samuel.stancl@gmail.com"
+                }
+            ],
+            "description": "Eloquent virtual column.",
+            "support": {
+                "issues": "https://github.com/archtechx/virtualcolumn/issues",
+                "source": "https://github.com/archtechx/virtualcolumn/tree/v1.5.0"
+            },
+            "time": "2025-02-25T13:12:44+00:00"
+        },
         {
             "name": "symfony/clock",
             "version": "v8.0.0",
diff --git a/config/tenancy.php b/config/tenancy.php
new file mode 100644
index 0000000..73908cf
--- /dev/null
+++ b/config/tenancy.php
@@ -0,0 +1,199 @@
+<?php
+
+declare(strict_types=1);
+
+use Stancl\Tenancy\Database\Models\Domain;
+use App\Models\Tenant;
+
+return [
+    'tenant_model' => Tenant::class,
+    'id_generator' => Stancl\Tenancy\UUIDGenerator::class,
+
+    'domain_model' => Domain::class,
+
+    /**
+     * The list of domains hosting your central app.
+     *
+     * Only relevant if you're using the domain or subdomain identification middleware.
+     */
+    'central_domains' => [
+        '127.0.0.1',
+        'localhost',
+    ],
+
+    /**
+     * Tenancy bootstrappers are executed when tenancy is initialized.
+     * Their responsibility is making Laravel features tenant-aware.
+     *
+     * To configure their behavior, see the config keys below.
+     */
+    'bootstrappers' => [
+        Stancl\Tenancy\Bootstrappers\DatabaseTenancyBootstrapper::class,
+        Stancl\Tenancy\Bootstrappers\CacheTenancyBootstrapper::class,
+        Stancl\Tenancy\Bootstrappers\FilesystemTenancyBootstrapper::class,
+        Stancl\Tenancy\Bootstrappers\QueueTenancyBootstrapper::class,
+        // Stancl\Tenancy\Bootstrappers\RedisTenancyBootstrapper::class, // Note: phpredis is needed
+    ],
+
+    /**
+     * Database tenancy config. Used by DatabaseTenancyBootstrapper.
+     */
+    'database' => [
+        'central_connection' => env('DB_CONNECTION', 'central'),
+
+        /**
+         * Connection used as a "template" for the dynamically created tenant database connection.
+         * Note: don't name your template connection tenant. That name is reserved by package.
+         */
+        'template_tenant_connection' => null,
+
+        /**
+         * Tenant database names are created like this:
+         * prefix + tenant_id + suffix.
+         */
+        'prefix' => 'tenant',
+        'suffix' => '',
+
+        /**
+         * TenantDatabaseManagers are classes that handle the creation & deletion of tenant databases.
+         */
+        'managers' => [
+            'sqlite' => Stancl\Tenancy\TenantDatabaseManagers\SQLiteDatabaseManager::class,
+            'mysql' => Stancl\Tenancy\TenantDatabaseManagers\MySQLDatabaseManager::class,
+            'pgsql' => Stancl\Tenancy\TenantDatabaseManagers\PostgreSQLDatabaseManager::class,
+
+        /**
+         * Use this database manager for MySQL to have a DB user created for each tenant database.
+         * You can customize the grants given to these users by changing the $grants property.
+         */
+            // 'mysql' => Stancl\Tenancy\TenantDatabaseManagers\PermissionControlledMySQLDatabaseManager::class,
+
+        /**
+         * Disable the pgsql manager above, and enable the one below if you
+         * want to separate tenant DBs by schemas rather than databases.
+         */
+            // 'pgsql' => Stancl\Tenancy\TenantDatabaseManagers\PostgreSQLSchemaManager::class, // Separate by schema instead of database
+        ],
+    ],
+
+    /**
+     * Cache tenancy config. Used by CacheTenancyBootstrapper.
+     *
+     * This works for all Cache facade calls, cache() helper
+     * calls and direct calls to injected cache stores.
+     *
+     * Each key in cache will have a tag applied on it. This tag is used to
+     * scope the cache both when writing to it and when reading from it.
+     *
+     * You can clear cache selectively by specifying the tag.
+     */
+    'cache' => [
+        'tag_base' => 'tenant', // This tag_base, followed by the tenant_id, will form a tag that will be applied on each cache call.
+    ],
+
+    /**
+     * Filesystem tenancy config. Used by FilesystemTenancyBootstrapper.
+     * https://tenancyforlaravel.com/docs/v3/tenancy-bootstrappers/#filesystem-tenancy-boostrapper.
+     */
+    'filesystem' => [
+        /**
+         * Each disk listed in the 'disks' array will be suffixed by the suffix_base, followed by the tenant_id.
+         */
+        'suffix_base' => 'tenant',
+        'disks' => [
+            'local',
+            'public',
+            // 's3',
+        ],
+
+        /**
+         * Use this for local disks.
+         *
+         * See https://tenancyforlaravel.com/docs/v3/tenancy-bootstrappers/#filesystem-tenancy-boostrapper
+         */
+        'root_override' => [
+            // Disks whose roots should be overridden after storage_path() is suffixed.
+            'local' => '%storage_path%/app/',
+            'public' => '%storage_path%/app/public/',
+        ],
+
+        /**
+         * Should storage_path() be suffixed.
+         *
+         * Note: Disabling this will likely break local disk tenancy. Only disable this if you're using an external file storage service like S3.
+         *
+         * For the vast majority of applications, this feature should be enabled. But in some
+         * edge cases, it can cause issues (like using Passport with Vapor - see #196), so
+         * you may want to disable this if you are experiencing these edge case issues.
+         */
+        'suffix_storage_path' => true,
+
+        /**
+         * By default, asset() calls are made multi-tenant too. You can use global_asset() and mix()
+         * for global, non-tenant-specific assets. However, you might have some issues when using
+         * packages that use asset() calls inside the tenant app. To avoid such issues, you can
+         * disable asset() helper tenancy and explicitly use tenant_asset() calls in places
+         * where you want to use tenant-specific assets (product images, avatars, etc).
+         */
+        'asset_helper_tenancy' => true,
+    ],
+
+    /**
+     * Redis tenancy config. Used by RedisTenancyBootstrapper.
+     *
+     * Note: You need phpredis to use Redis tenancy.
+     *
+     * Note: You don't need to use this if you're using Redis only for cache.
+     * Redis tenancy is only relevant if you're making direct Redis calls,
+     * either using the Redis facade or by injecting it as a dependency.
+     */
+    'redis' => [
+        'prefix_base' => 'tenant', // Each key in Redis will be prepended by this prefix_base, followed by the tenant id.
+        'prefixed_connections' => [ // Redis connections whose keys are prefixed, to separate one tenant's keys from another.
+            // 'default',
+        ],
+    ],
+
+    /**
+     * Features are classes that provide additional functionality
+     * not needed for tenancy to be bootstrapped. They are run
+     * regardless of whether tenancy has been initialized.
+     *
+     * See the documentation page for each class to
+     * understand which ones you want to enable.
+     */
+    'features' => [
+        // Stancl\Tenancy\Features\UserImpersonation::class,
+        // Stancl\Tenancy\Features\TelescopeTags::class,
+        // Stancl\Tenancy\Features\UniversalRoutes::class,
+        // Stancl\Tenancy\Features\TenantConfig::class, // https://tenancyforlaravel.com/docs/v3/features/tenant-config
+        // Stancl\Tenancy\Features\CrossDomainRedirect::class, // https://tenancyforlaravel.com/docs/v3/features/cross-domain-redirect
+        // Stancl\Tenancy\Features\ViteBundler::class,
+    ],
+
+    /**
+     * Should tenancy routes be registered.
+     *
+     * Tenancy routes include tenant asset routes. By default, this route is
+     * enabled. But it may be useful to disable them if you use external
+     * storage (e.g. S3 / Dropbox) or have a custom asset controller.
+     */
+    'routes' => true,
+
+    /**
+     * Parameters used by the tenants:migrate command.
+     */
+    'migration_parameters' => [
+        '--force' => true, // This needs to be true to run migrations in production.
+        '--path' => [database_path('migrations/tenant')],
+        '--realpath' => true,
+    ],
+
+    /**
+     * Parameters used by the tenants:seed command.
+     */
+    'seeder_parameters' => [
+        '--class' => 'DatabaseSeeder', // root seeder class
+        // '--force' => true, // This needs to be true to seed tenant databases in production
+    ],
+];
diff --git a/database/migrations/2019_09_15_000010_create_tenants_table.php b/database/migrations/2019_09_15_000010_create_tenants_table.php
new file mode 100644
index 0000000..ec73065
--- /dev/null
+++ b/database/migrations/2019_09_15_000010_create_tenants_table.php
@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateTenantsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up(): void
+    {
+        Schema::create('tenants', function (Blueprint $table) {
+            $table->string('id')->primary();
+
+            // your custom columns may go here
+
+            $table->timestamps();
+            $table->json('data')->nullable();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('tenants');
+    }
+}
diff --git a/database/migrations/2019_09_15_000020_create_domains_table.php b/database/migrations/2019_09_15_000020_create_domains_table.php
new file mode 100644
index 0000000..77c1b88
--- /dev/null
+++ b/database/migrations/2019_09_15_000020_create_domains_table.php
@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateDomainsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up(): void
+    {
+        Schema::create('domains', function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('domain', 255)->unique();
+            $table->string('tenant_id');
+
+            $table->timestamps();
+            $table->foreign('tenant_id')->references('id')->on('tenants')->onUpdate('cascade')->onDelete('cascade');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('domains');
+    }
+}
diff --git a/database/migrations/0001_01_01_000000_create_users_table.php b/database/migrations/tenant/0001_01_01_000000_create_users_table.php
similarity index 100%
rename from database/migrations/0001_01_01_000000_create_users_table.php
rename to database/migrations/tenant/0001_01_01_000000_create_users_table.php
diff --git a/database/migrations/0001_01_01_000001_create_cache_table.php b/database/migrations/tenant/0001_01_01_000001_create_cache_table.php
similarity index 100%
rename from database/migrations/0001_01_01_000001_create_cache_table.php
rename to database/migrations/tenant/0001_01_01_000001_create_cache_table.php
diff --git a/database/migrations/0001_01_01_000002_create_jobs_table.php b/database/migrations/tenant/0001_01_01_000002_create_jobs_table.php
similarity index 100%
rename from database/migrations/0001_01_01_000002_create_jobs_table.php
rename to database/migrations/tenant/0001_01_01_000002_create_jobs_table.php
diff --git a/database/migrations/2025_12_26_151600_create_categories_table.php b/database/migrations/tenant/2025_12_26_151600_create_categories_table.php
similarity index 100%
rename from database/migrations/2025_12_26_151600_create_categories_table.php
rename to database/migrations/tenant/2025_12_26_151600_create_categories_table.php
diff --git a/database/migrations/2025_12_26_151700_create_products_table.php b/database/migrations/tenant/2025_12_26_151700_create_products_table.php
similarity index 100%
rename from database/migrations/2025_12_26_151700_create_products_table.php
rename to database/migrations/tenant/2025_12_26_151700_create_products_table.php
diff --git a/database/migrations/2025_12_29_012901_create_vendors_table.php b/database/migrations/tenant/2025_12_29_012901_create_vendors_table.php
similarity index 100%
rename from database/migrations/2025_12_29_012901_create_vendors_table.php
rename to database/migrations/tenant/2025_12_29_012901_create_vendors_table.php
diff --git a/database/migrations/2025_12_29_033314_optimize_string_columns.php b/database/migrations/tenant/2025_12_29_033314_optimize_string_columns.php
similarity index 100%
rename from database/migrations/2025_12_29_033314_optimize_string_columns.php
rename to database/migrations/tenant/2025_12_29_033314_optimize_string_columns.php
diff --git a/database/migrations/2025_12_29_034457_create_warehouse_tables.php b/database/migrations/tenant/2025_12_29_034457_create_warehouse_tables.php
similarity index 100%
rename from database/migrations/2025_12_29_034457_create_warehouse_tables.php
rename to database/migrations/tenant/2025_12_29_034457_create_warehouse_tables.php
diff --git a/database/migrations/2025_12_29_064110_update_inventory_transactions_type_comment.php b/database/migrations/tenant/2025_12_29_064110_update_inventory_transactions_type_comment.php
similarity index 100%
rename from database/migrations/2025_12_29_064110_update_inventory_transactions_type_comment.php
rename to database/migrations/tenant/2025_12_29_064110_update_inventory_transactions_type_comment.php
diff --git a/database/migrations/2025_12_29_065101_add_actual_time_to_inventory_transactions_table.php b/database/migrations/tenant/2025_12_29_065101_add_actual_time_to_inventory_transactions_table.php
similarity index 100%
rename from database/migrations/2025_12_29_065101_add_actual_time_to_inventory_transactions_table.php
rename to database/migrations/tenant/2025_12_29_065101_add_actual_time_to_inventory_transactions_table.php
diff --git a/database/migrations/2025_12_29_101000_create_product_vendor_table.php b/database/migrations/tenant/2025_12_29_101000_create_product_vendor_table.php
similarity index 100%
rename from database/migrations/2025_12_29_101000_create_product_vendor_table.php
rename to database/migrations/tenant/2025_12_29_101000_create_product_vendor_table.php
diff --git a/database/migrations/2025_12_30_103000_update_inventories_safety_stock_default.php b/database/migrations/tenant/2025_12_30_103000_update_inventories_safety_stock_default.php
similarity index 100%
rename from database/migrations/2025_12_30_103000_update_inventories_safety_stock_default.php
rename to database/migrations/tenant/2025_12_30_103000_update_inventories_safety_stock_default.php
diff --git a/database/migrations/2025_12_30_130612_create_purchase_orders_table.php b/database/migrations/tenant/2025_12_30_130612_create_purchase_orders_table.php
similarity index 100%
rename from database/migrations/2025_12_30_130612_create_purchase_orders_table.php
rename to database/migrations/tenant/2025_12_30_130612_create_purchase_orders_table.php
diff --git a/database/migrations/2025_12_30_130613_create_purchase_order_items_table.php b/database/migrations/tenant/2025_12_30_130613_create_purchase_order_items_table.php
similarity index 100%
rename from database/migrations/2025_12_30_130613_create_purchase_order_items_table.php
rename to database/migrations/tenant/2025_12_30_130613_create_purchase_order_items_table.php
diff --git a/database/migrations/2025_12_31_172200_make_conversion_rate_nullable.php b/database/migrations/tenant/2025_12_31_172200_make_conversion_rate_nullable.php
similarity index 100%
rename from database/migrations/2025_12_31_172200_make_conversion_rate_nullable.php
rename to database/migrations/tenant/2025_12_31_172200_make_conversion_rate_nullable.php
diff --git a/database/migrations/2026_01_07_132554_add_username_to_users_table.php b/database/migrations/tenant/2026_01_07_132554_add_username_to_users_table.php
similarity index 100%
rename from database/migrations/2026_01_07_132554_add_username_to_users_table.php
rename to database/migrations/tenant/2026_01_07_132554_add_username_to_users_table.php
diff --git a/database/migrations/2026_01_08_103000_create_units_table.php b/database/migrations/tenant/2026_01_08_103000_create_units_table.php
similarity index 100%
rename from database/migrations/2026_01_08_103000_create_units_table.php
rename to database/migrations/tenant/2026_01_08_103000_create_units_table.php
diff --git a/database/migrations/2026_01_08_103500_update_products_table_units.php b/database/migrations/tenant/2026_01_08_103500_update_products_table_units.php
similarity index 100%
rename from database/migrations/2026_01_08_103500_update_products_table_units.php
rename to database/migrations/tenant/2026_01_08_103500_update_products_table_units.php
diff --git a/database/migrations/2026_01_08_152856_add_unit_to_purchase_order_items_table.php b/database/migrations/tenant/2026_01_08_152856_add_unit_to_purchase_order_items_table.php
similarity index 100%
rename from database/migrations/2026_01_08_152856_add_unit_to_purchase_order_items_table.php
rename to database/migrations/tenant/2026_01_08_152856_add_unit_to_purchase_order_items_table.php
diff --git a/database/migrations/2026_01_08_154909_add_unit_id_to_purchase_order_items_table.php b/database/migrations/tenant/2026_01_08_154909_add_unit_id_to_purchase_order_items_table.php
similarity index 100%
rename from database/migrations/2026_01_08_154909_add_unit_id_to_purchase_order_items_table.php
rename to database/migrations/tenant/2026_01_08_154909_add_unit_id_to_purchase_order_items_table.php
diff --git a/database/migrations/2026_01_09_095718_add_invoice_fields_to_purchase_orders_table.php b/database/migrations/tenant/2026_01_09_095718_add_invoice_fields_to_purchase_orders_table.php
similarity index 100%
rename from database/migrations/2026_01_09_095718_add_invoice_fields_to_purchase_orders_table.php
rename to database/migrations/tenant/2026_01_09_095718_add_invoice_fields_to_purchase_orders_table.php
diff --git a/database/migrations/2026_01_13_113720_create_permission_tables.php b/database/migrations/tenant/2026_01_13_113720_create_permission_tables.php
similarity index 100%
rename from database/migrations/2026_01_13_113720_create_permission_tables.php
rename to database/migrations/tenant/2026_01_13_113720_create_permission_tables.php
diff --git a/database/migrations/2026_01_13_160117_add_display_name_to_roles_table.php b/database/migrations/tenant/2026_01_13_160117_add_display_name_to_roles_table.php
similarity index 100%
rename from database/migrations/2026_01_13_160117_add_display_name_to_roles_table.php
rename to database/migrations/tenant/2026_01_13_160117_add_display_name_to_roles_table.php
diff --git a/database/migrations/2026_01_13_160741_add_inventory_delete_permission.php b/database/migrations/tenant/2026_01_13_160741_add_inventory_delete_permission.php
similarity index 100%
rename from database/migrations/2026_01_13_160741_add_inventory_delete_permission.php
rename to database/migrations/tenant/2026_01_13_160741_add_inventory_delete_permission.php
diff --git a/database/migrations/2026_01_13_162407_add_safety_stock_permissions.php b/database/migrations/tenant/2026_01_13_162407_add_safety_stock_permissions.php
similarity index 100%
rename from database/migrations/2026_01_13_162407_add_safety_stock_permissions.php
rename to database/migrations/tenant/2026_01_13_162407_add_safety_stock_permissions.php
diff --git a/database/migrations/2026_01_13_171300_assign_admin_user_super_admin_role.php b/database/migrations/tenant/2026_01_13_171300_assign_admin_user_super_admin_role.php
similarity index 100%
rename from database/migrations/2026_01_13_171300_assign_admin_user_super_admin_role.php
rename to database/migrations/tenant/2026_01_13_171300_assign_admin_user_super_admin_role.php
diff --git a/database/migrations/2026_01_13_171900_sync_super_admin_all_permissions.php b/database/migrations/tenant/2026_01_13_171900_sync_super_admin_all_permissions.php
similarity index 100%
rename from database/migrations/2026_01_13_171900_sync_super_admin_all_permissions.php
rename to database/migrations/tenant/2026_01_13_171900_sync_super_admin_all_permissions.php
diff --git a/database/migrations/2026_01_13_172500_ensure_admin_is_super_admin.php b/database/migrations/tenant/2026_01_13_172500_ensure_admin_is_super_admin.php
similarity index 100%
rename from database/migrations/2026_01_13_172500_ensure_admin_is_super_admin.php
rename to database/migrations/tenant/2026_01_13_172500_ensure_admin_is_super_admin.php
diff --git a/database/migrations/2026_01_14_090000_update_role_display_names.php b/database/migrations/tenant/2026_01_14_090000_update_role_display_names.php
similarity index 100%
rename from database/migrations/2026_01_14_090000_update_role_display_names.php
rename to database/migrations/tenant/2026_01_14_090000_update_role_display_names.php
diff --git a/docs/multi-tenancy-deployment.md b/docs/multi-tenancy-deployment.md
new file mode 100644
index 0000000..a86e49e
--- /dev/null
+++ b/docs/multi-tenancy-deployment.md
@@ -0,0 +1,71 @@
+# Multi-tenancy 部署手冊
+
+> 記錄本地開發完成後，上 Demo/Production 環境時需要手動執行的操作。
+> CI/CD 會自動執行的項目已排除。
+
+---
+
+## Step 1: 安裝 stancl/tenancy
+**CI/CD 會自動執行**：`composer install`
+**手動操作**：無
+
+---
+
+## Step 2: 設定 Central Domain + Tenant 識別
+**手動操作**：
+1. 修改 `.env`，加入：
+   ```bash
+   # Demo 環境 (192.168.0.103)
+   CENTRAL_DOMAINS=192.168.0.103,localhost
+   
+   # Production 環境 (erp.koori.tw)
+   CENTRAL_DOMAINS=erp.koori.tw
+   ```
+
+---
+
+## Step 3: 分離 Migrations
+**CI/CD 會自動執行**：`php artisan migrate --force`
+**手動操作**：無
+
+> 注意：migrations 結構已調整如下：
+> - `database/migrations/` - Central tables (tenants, domains)
+> - `database/migrations/tenant/` - Tenant tables (所有業務表)
+
+---
+
+## Step 4: 遷移現有資料到 tenant_koori
+**首次部署手動操作**：
+1. 授予 MySQL sail 使用者 CREATE DATABASE 權限：
+   ```bash
+   docker exec koori-erp-mysql mysql -uroot -p[PASSWORD] -e "GRANT ALL PRIVILEGES ON *.* TO 'sail'@'%' WITH GRANT OPTION; FLUSH PRIVILEGES;"
+   ```
+
+2. 建立第一個租戶 (小小冰室)：
+   ```bash
+   docker exec -w /var/www/html koori-erp-laravel php artisan tinker --execute="
+   use App\Models\Tenant;
+   Tenant::create(['id' => 'koori', 'name' => '小小冰室']);
+   "
+   ```
+
+3. 為租戶綁定域名：
+   ```bash
+   docker exec -w /var/www/html koori-erp-laravel php artisan tinker --execute="
+   use App\Models\Tenant;
+   Tenant::find('koori')->domains()->create(['domain' => 'koori.your-domain.com']);
+   "
+   ```
+
+4. 執行資料遷移 (從 central DB 複製到 tenant DB)：
+   ```bash
+   docker exec -w /var/www/html koori-erp-laravel php artisan tenancy:migrate-data koori
+   ```
+
+## Step 5: 建立房東後台
+**手動操作**：無
+
+---
+
+## 其他注意事項
+- 待補充...
diff --git a/resources/js/Layouts/LandlordLayout.tsx b/resources/js/Layouts/LandlordLayout.tsx
new file mode 100644
index 0000000..f5e9958
--- /dev/null
+++ b/resources/js/Layouts/LandlordLayout.tsx
@@ -0,0 +1,132 @@
+import { Link, usePage } from "@inertiajs/react";
+import { cn } from "@/lib/utils";
+import {
+    Building2,
+    LayoutDashboard,
+    LogOut,
+    User,
+} from "lucide-react";
+import { Toaster } from "sonner";
+import {
+    DropdownMenu,
+    DropdownMenuContent,
+    DropdownMenuItem,
+    DropdownMenuLabel,
+    DropdownMenuSeparator,
+    DropdownMenuTrigger,
+} from "@/Components/ui/dropdown-menu";
+
+interface LandlordLayoutProps {
+    children: React.ReactNode;
+    title?: string;
+}
+
+export default function LandlordLayout({ children, title }: LandlordLayoutProps) {
+    const { url, props } = usePage();
+    // @ts-ignore
+    const user = props.auth?.user || { name: 'Admin', username: 'admin' };
+
+    const menuItems = [
+        {
+            label: "儀表板",
+            href: "/landlord",
+            icon: LayoutDashboard,
+            active: url === "/landlord" || url === "/landlord/",
+        },
+        {
+            label: "租戶管理",
+            href: "/landlord/tenants",
+            icon: Building2,
+            active: url.startsWith("/landlord/tenants"),
+        },
+    ];
+
+    return (
+        <div className="flex min-h-screen bg-slate-50">
+            {/* Sidebar */}
+            <aside className="fixed left-0 top-0 bottom-0 w-64 bg-slate-900 text-white flex flex-col">
+                <div className="h-16 flex items-center px-6 border-b border-slate-800">
+                    <Link href="/landlord" className="flex items-center gap-2">
+                        <div className="w-8 h-8 bg-primary-main rounded-lg flex items-center justify-center">
+                            <Building2 className="w-5 h-5 text-white" />
+                        </div>
+                        <span className="font-bold text-lg">房東後台</span>
+                    </Link>
+                </div>
+
+                <nav className="flex-1 p-4 space-y-1">
+                    {menuItems.map((item) => (
+                        <Link
+                            key={item.href}
+                            href={item.href}
+                            className={cn(
+                                "flex items-center gap-3 px-3 py-2.5 rounded-lg transition-colors",
+                                item.active
+                                    ? "bg-primary-main text-white"
+                                    : "text-slate-400 hover:bg-slate-800 hover:text-white"
+                            )}
+                        >
+                            <item.icon className="w-5 h-5" />
+                            <span className="font-medium">{item.label}</span>
+                        </Link>
+                    ))}
+                </nav>
+
+                <div className="p-4 border-t border-slate-800">
+                    <Link
+                        href="/"
+                        className="flex items-center gap-2 text-slate-400 hover:text-white transition-colors text-sm"
+                    >
+                        ← 返回 ERP 系統
+                    </Link>
+                </div>
+            </aside>
+
+            {/* Main Content */}
+            <main className="flex-1 ml-64">
+                {/* Header */}
+                <header className="h-16 bg-white border-b border-slate-200 flex items-center justify-between px-6">
+                    <h1 className="text-lg font-semibold text-slate-900">
+                        {title || "房東管理後台"}
+                    </h1>
+
+                    <DropdownMenu modal={false}>
+                        <DropdownMenuTrigger className="flex items-center gap-2 outline-none group">
+                            <div className="flex flex-col items-end mr-1">
+                                <span className="text-sm font-medium text-slate-700">
+                                    {user.name}
+                                </span>
+                                <span className="text-xs text-slate-500">系統管理員</span>
+                            </div>
+                            <div className="h-9 w-9 bg-slate-100 rounded-full flex items-center justify-center">
+                                <User className="h-5 w-5 text-slate-600" />
+                            </div>
+                        </DropdownMenuTrigger>
+                        <DropdownMenuContent align="end" className="w-56 z-[100]">
+                            <DropdownMenuLabel>我的帳號</DropdownMenuLabel>
+                            <DropdownMenuSeparator />
+                            <DropdownMenuItem asChild>
+                                <Link
+                                    href={route('logout')}
+                                    method="post"
+                                    as="button"
+                                    className="w-full flex items-center cursor-pointer text-red-600"
+                                >
+                                    <LogOut className="mr-2 h-4 w-4" />
+                                    <span>登出系統</span>
+                                </Link>
+                            </DropdownMenuItem>
+                        </DropdownMenuContent>
+                    </DropdownMenu>
+                </header>
+
+                {/* Content */}
+                <div className="p-6">
+                    {children}
+                </div>
+            </main>
+
+            <Toaster richColors closeButton position="top-center" />
+        </div>
+    );
+}
diff --git a/resources/js/Pages/Landlord/Dashboard.tsx b/resources/js/Pages/Landlord/Dashboard.tsx
new file mode 100644
index 0000000..a4b4d72
--- /dev/null
+++ b/resources/js/Pages/Landlord/Dashboard.tsx
@@ -0,0 +1,106 @@
+import LandlordLayout from "@/Layouts/LandlordLayout";
+import { Building2, Users, Activity } from "lucide-react";
+import { Link } from "@inertiajs/react";
+
+interface Tenant {
+    id: string;
+    name: string;
+    is_active: boolean;
+    created_at: string;
+    domains: string[];
+}
+
+interface DashboardProps {
+    totalTenants: number;
+    activeTenants: number;
+    recentTenants: Tenant[];
+}
+
+export default function Dashboard({ totalTenants, activeTenants, recentTenants }: DashboardProps) {
+    const statsCards = [
+        {
+            title: "租戶總數",
+            value: totalTenants,
+            icon: Building2,
+            color: "bg-blue-500",
+        },
+        {
+            title: "啟用中",
+            value: activeTenants,
+            icon: Activity,
+            color: "bg-green-500",
+        },
+        {
+            title: "停用中",
+            value: totalTenants - activeTenants,
+            icon: Users,
+            color: "bg-slate-400",
+        },
+    ];
+
+    return (
+        <LandlordLayout title="儀表板">
+            <div className="space-y-6">
+                {/* Stats Cards */}
+                <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
+                    {statsCards.map((stat) => (
+                        <div
+                            key={stat.title}
+                            className="bg-white rounded-xl border border-slate-200 p-6 flex items-center gap-4"
+                        >
+                            <div className={`w-12 h-12 ${stat.color} rounded-lg flex items-center justify-center`}>
+                                <stat.icon className="w-6 h-6 text-white" />
+                            </div>
+                            <div>
+                                <p className="text-sm text-slate-500">{stat.title}</p>
+                                <p className="text-2xl font-bold text-slate-900">{stat.value}</p>
+                            </div>
+                        </div>
+                    ))}
+                </div>
+
+                {/* Recent Tenants */}
+                <div className="bg-white rounded-xl border border-slate-200 overflow-hidden">
+                    <div className="px-6 py-4 border-b border-slate-200 flex items-center justify-between">
+                        <h2 className="text-lg font-semibold text-slate-900">最近新增的租戶</h2>
+                        <Link
+                            href="/landlord/tenants"
+                            className="text-sm text-primary-main hover:underline"
+                        >
+                            查看全部 →
+                        </Link>
+                    </div>
+                    <div className="divide-y divide-slate-100">
+                        {recentTenants.length === 0 ? (
+                            <div className="px-6 py-8 text-center text-slate-500">
+                                尚無租戶資料
+                            </div>
+                        ) : (
+                            recentTenants.map((tenant) => (
+                                <div key={tenant.id} className="px-6 py-4 flex items-center justify-between">
+                                    <div>
+                                        <p className="font-medium text-slate-900">{tenant.name}</p>
+                                        <p className="text-sm text-slate-500">
+                                            {tenant.domains.length > 0 ? tenant.domains.join(", ") : "無綁定域名"}
+                                        </p>
+                                    </div>
+                                    <div className="flex items-center gap-3">
+                                        <span
+                                            className={`px-2 py-1 rounded-full text-xs font-medium ${tenant.is_active
+                                                    ? "bg-green-100 text-green-700"
+                                                    : "bg-slate-100 text-slate-600"
+                                                }`}
+                                        >
+                                            {tenant.is_active ? "啟用" : "停用"}
+                                        </span>
+                                        <span className="text-sm text-slate-400">{tenant.created_at}</span>
+                                    </div>
+                                </div>
+                            ))
+                        )}
+                    </div>
+                </div>
+            </div>
+        </LandlordLayout>
+    );
+}
diff --git a/resources/js/Pages/Landlord/Tenant/Create.tsx b/resources/js/Pages/Landlord/Tenant/Create.tsx
new file mode 100644
index 0000000..1e47b47
--- /dev/null
+++ b/resources/js/Pages/Landlord/Tenant/Create.tsx
@@ -0,0 +1,104 @@
+import LandlordLayout from "@/Layouts/LandlordLayout";
+import { useForm, Link } from "@inertiajs/react";
+import { FormEvent } from "react";
+
+export default function TenantCreate() {
+    const { data, setData, post, processing, errors } = useForm({
+        id: "",
+        name: "",
+        email: "",
+        domain: "",
+    });
+
+    const handleSubmit = (e: FormEvent) => {
+        e.preventDefault();
+        post(route("landlord.tenants.store"));
+    };
+
+    return (
+        <LandlordLayout title="新增租戶">
+            <div className="max-w-2xl">
+                <div className="mb-6">
+                    <h1 className="text-2xl font-bold text-slate-900">新增租戶</h1>
+                    <p className="text-slate-500 mt-1">建立一個新的租戶帳號</p>
+                </div>
+
+                <form onSubmit={handleSubmit} className="bg-white rounded-xl border border-slate-200 p-6 space-y-6">
+                    <div>
+                        <label className="block text-sm font-medium text-slate-700 mb-2">
+                            租戶 ID <span className="text-red-500">*</span>
+                        </label>
+                        <input
+                            type="text"
+                            value={data.id}
+                            onChange={(e) => setData("id", e.target.value.toLowerCase())}
+                            placeholder="例如：koori, alcohol"
+                            className="w-full px-4 py-2 border border-slate-300 rounded-lg focus:ring-2 focus:ring-primary-main focus:border-primary-main"
+                        />
+                        <p className="mt-1 text-sm text-slate-500">只能使用英文、數字、底線</p>
+                        {errors.id && <p className="mt-1 text-sm text-red-500">{errors.id}</p>}
+                    </div>
+
+                    <div>
+                        <label className="block text-sm font-medium text-slate-700 mb-2">
+                            租戶名稱 <span className="text-red-500">*</span>
+                        </label>
+                        <input
+                            type="text"
+                            value={data.name}
+                            onChange={(e) => setData("name", e.target.value)}
+                            placeholder="例如：小小冰室"
+                            className="w-full px-4 py-2 border border-slate-300 rounded-lg focus:ring-2 focus:ring-primary-main focus:border-primary-main"
+                        />
+                        {errors.name && <p className="mt-1 text-sm text-red-500">{errors.name}</p>}
+                    </div>
+
+                    <div>
+                        <label className="block text-sm font-medium text-slate-700 mb-2">
+                            聯絡信箱
+                        </label>
+                        <input
+                            type="email"
+                            value={data.email}
+                            onChange={(e) => setData("email", e.target.value)}
+                            placeholder="admin@example.com"
+                            className="w-full px-4 py-2 border border-slate-300 rounded-lg focus:ring-2 focus:ring-primary-main focus:border-primary-main"
+                        />
+                        {errors.email && <p className="mt-1 text-sm text-red-500">{errors.email}</p>}
+                    </div>
+
+                    <div>
+                        <label className="block text-sm font-medium text-slate-700 mb-2">
+                            綁定域名
+                        </label>
+                        <input
+                            type="text"
+                            value={data.domain}
+                            onChange={(e) => setData("domain", e.target.value)}
+                            placeholder="例如：koori.erp.koori.tw"
+                            className="w-full px-4 py-2 border border-slate-300 rounded-lg focus:ring-2 focus:ring-primary-main focus:border-primary-main"
+                        />
+                        <p className="mt-1 text-sm text-slate-500">可之後再設定</p>
+                        {errors.domain && <p className="mt-1 text-sm text-red-500">{errors.domain}</p>}
+                    </div>
+
+                    <div className="flex items-center gap-4 pt-4 border-t">
+                        <button
+                            type="submit"
+                            disabled={processing}
+                            className="bg-primary-main hover:bg-primary-dark text-white px-6 py-2 rounded-lg disabled:opacity-50 transition-colors"
+                        >
+                            {processing ? "處理中..." : "建立租戶"}
+                        </button>
+                        <Link
+                            href="/landlord/tenants"
+                            className="text-slate-600 hover:text-slate-900"
+                        >
+                            取消
+                        </Link>
+                    </div>
+                </form>
+            </div>
+        </LandlordLayout>
+    );
+}
diff --git a/resources/js/Pages/Landlord/Tenant/Edit.tsx b/resources/js/Pages/Landlord/Tenant/Edit.tsx
new file mode 100644
index 0000000..87d7675
--- /dev/null
+++ b/resources/js/Pages/Landlord/Tenant/Edit.tsx
@@ -0,0 +1,107 @@
+import LandlordLayout from "@/Layouts/LandlordLayout";
+import { useForm, Link } from "@inertiajs/react";
+import { FormEvent } from "react";
+
+interface Tenant {
+    id: string;
+    name: string;
+    email: string | null;
+    is_active: boolean;
+}
+
+interface Props {
+    tenant: Tenant;
+}
+
+export default function TenantEdit({ tenant }: Props) {
+    const { data, setData, put, processing, errors } = useForm({
+        name: tenant.name,
+        email: tenant.email || "",
+        is_active: tenant.is_active,
+    });
+
+    const handleSubmit = (e: FormEvent) => {
+        e.preventDefault();
+        put(route("landlord.tenants.update", tenant.id));
+    };
+
+    return (
+        <LandlordLayout title="編輯租戶">
+            <div className="max-w-2xl">
+                <div className="mb-6">
+                    <h1 className="text-2xl font-bold text-slate-900">編輯租戶</h1>
+                    <p className="text-slate-500 mt-1">修改租戶 {tenant.id} 的資訊</p>
+                </div>
+
+                <form onSubmit={handleSubmit} className="bg-white rounded-xl border border-slate-200 p-6 space-y-6">
+                    <div>
+                        <label className="block text-sm font-medium text-slate-700 mb-2">
+                            租戶 ID
+                        </label>
+                        <input
+                            type="text"
+                            value={tenant.id}
+                            disabled
+                            className="w-full px-4 py-2 border border-slate-200 rounded-lg bg-slate-50 text-slate-500"
+                        />
+                        <p className="mt-1 text-sm text-slate-500">租戶 ID 無法修改</p>
+                    </div>
+
+                    <div>
+                        <label className="block text-sm font-medium text-slate-700 mb-2">
+                            租戶名稱 <span className="text-red-500">*</span>
+                        </label>
+                        <input
+                            type="text"
+                            value={data.name}
+                            onChange={(e) => setData("name", e.target.value)}
+                            className="w-full px-4 py-2 border border-slate-300 rounded-lg focus:ring-2 focus:ring-primary-main focus:border-primary-main"
+                        />
+                        {errors.name && <p className="mt-1 text-sm text-red-500">{errors.name}</p>}
+                    </div>
+
+                    <div>
+                        <label className="block text-sm font-medium text-slate-700 mb-2">
+                            聯絡信箱
+                        </label>
+                        <input
+                            type="email"
+                            value={data.email}
+                            onChange={(e) => setData("email", e.target.value)}
+                            className="w-full px-4 py-2 border border-slate-300 rounded-lg focus:ring-2 focus:ring-primary-main focus:border-primary-main"
+                        />
+                        {errors.email && <p className="mt-1 text-sm text-red-500">{errors.email}</p>}
+                    </div>
+
+                    <div>
+                        <label className="flex items-center gap-2">
+                            <input
+                                type="checkbox"
+                                checked={data.is_active}
+                                onChange={(e) => setData("is_active", e.target.checked)}
+                                className="w-4 h-4 rounded border-slate-300 text-primary-main focus:ring-primary-main"
+                            />
+                            <span className="text-sm font-medium text-slate-700">啟用此租戶</span>
+                        </label>
+                    </div>
+
+                    <div className="flex items-center gap-4 pt-4 border-t">
+                        <button
+                            type="submit"
+                            disabled={processing}
+                            className="bg-primary-main hover:bg-primary-dark text-white px-6 py-2 rounded-lg disabled:opacity-50 transition-colors"
+                        >
+                            {processing ? "儲存中..." : "儲存變更"}
+                        </button>
+                        <Link
+                            href="/landlord/tenants"
+                            className="text-slate-600 hover:text-slate-900"
+                        >
+                            取消
+                        </Link>
+                    </div>
+                </form>
+            </div>
+        </LandlordLayout>
+    );
+}
diff --git a/resources/js/Pages/Landlord/Tenant/Index.tsx b/resources/js/Pages/Landlord/Tenant/Index.tsx
new file mode 100644
index 0000000..9776265
--- /dev/null
+++ b/resources/js/Pages/Landlord/Tenant/Index.tsx
@@ -0,0 +1,188 @@
+import LandlordLayout from "@/Layouts/LandlordLayout";
+import { Link, router } from "@inertiajs/react";
+import { Plus, Edit, Trash2, Globe } from "lucide-react";
+import { useState } from "react";
+import {
+    AlertDialog,
+    AlertDialogAction,
+    AlertDialogCancel,
+    AlertDialogContent,
+    AlertDialogDescription,
+    AlertDialogFooter,
+    AlertDialogHeader,
+    AlertDialogTitle,
+} from "@/Components/ui/alert-dialog";
+
+interface Tenant {
+    id: string;
+    name: string;
+    email: string | null;
+    is_active: boolean;
+    created_at: string;
+    domains: string[];
+}
+
+interface Props {
+    tenants: Tenant[];
+}
+
+export default function TenantIndex({ tenants }: Props) {
+    const [deleteTarget, setDeleteTarget] = useState<Tenant | null>(null);
+
+    const handleDelete = () => {
+        if (deleteTarget) {
+            router.delete(route("landlord.tenants.destroy", deleteTarget.id));
+            setDeleteTarget(null);
+        }
+    };
+
+    return (
+        <LandlordLayout title="租戶管理">
+            <div className="space-y-6">
+                {/* Header */}
+                <div className="flex items-center justify-between">
+                    <div>
+                        <h1 className="text-2xl font-bold text-slate-900">租戶管理</h1>
+                        <p className="text-slate-500 mt-1">管理系統中的所有租戶</p>
+                    </div>
+                    <Link
+                        href="/landlord/tenants/create"
+                        className="bg-primary-main hover:bg-primary-dark text-white px-4 py-2 rounded-lg flex items-center gap-2 transition-colors"
+                    >
+                        <Plus className="w-4 h-4" />
+                        新增租戶
+                    </Link>
+                </div>
+
+                {/* Table */}
+                <div className="bg-white rounded-xl border border-slate-200 overflow-hidden">
+                    <table className="w-full">
+                        <thead className="bg-slate-50">
+                            <tr>
+                                <th className="px-6 py-3 text-left text-xs font-semibold text-slate-500 uppercase">
+                                    ID
+                                </th>
+                                <th className="px-6 py-3 text-left text-xs font-semibold text-slate-500 uppercase">
+                                    名稱
+                                </th>
+                                <th className="px-6 py-3 text-left text-xs font-semibold text-slate-500 uppercase">
+                                    域名
+                                </th>
+                                <th className="px-6 py-3 text-left text-xs font-semibold text-slate-500 uppercase">
+                                    狀態
+                                </th>
+                                <th className="px-6 py-3 text-left text-xs font-semibold text-slate-500 uppercase">
+                                    建立時間
+                                </th>
+                                <th className="px-6 py-3 text-right text-xs font-semibold text-slate-500 uppercase">
+                                    操作
+                                </th>
+                            </tr>
+                        </thead>
+                        <tbody className="divide-y divide-slate-100">
+                            {tenants.length === 0 ? (
+                                <tr>
+                                    <td colSpan={6} className="px-6 py-12 text-center text-slate-500">
+                                        尚無租戶資料，請點擊「新增租戶」建立第一個租戶
+                                    </td>
+                                </tr>
+                            ) : (
+                                tenants.map((tenant) => (
+                                    <tr key={tenant.id} className="hover:bg-slate-50">
+                                        <td className="px-6 py-4 font-mono text-sm text-slate-600">
+                                            {tenant.id}
+                                        </td>
+                                        <td className="px-6 py-4">
+                                            <div>
+                                                <p className="font-medium text-slate-900">{tenant.name}</p>
+                                                {tenant.email && (
+                                                    <p className="text-sm text-slate-500">{tenant.email}</p>
+                                                )}
+                                            </div>
+                                        </td>
+                                        <td className="px-6 py-4">
+                                            {tenant.domains.length > 0 ? (
+                                                <div className="flex items-center gap-1 flex-wrap">
+                                                    {tenant.domains.map((domain) => (
+                                                        <span
+                                                            key={domain}
+                                                            className="inline-flex items-center gap-1 px-2 py-1 bg-slate-100 rounded text-xs"
+                                                        >
+                                                            <Globe className="w-3 h-3" />
+                                                            {domain}
+                                                        </span>
+                                                    ))}
+                                                </div>
+                                            ) : (
+                                                <span className="text-slate-400 text-sm">無</span>
+                                            )}
+                                        </td>
+                                        <td className="px-6 py-4">
+                                            <span
+                                                className={`px-2 py-1 rounded-full text-xs font-medium ${tenant.is_active
+                                                        ? "bg-green-100 text-green-700"
+                                                        : "bg-slate-100 text-slate-600"
+                                                    }`}
+                                            >
+                                                {tenant.is_active ? "啟用" : "停用"}
+                                            </span>
+                                        </td>
+                                        <td className="px-6 py-4 text-sm text-slate-500">
+                                            {tenant.created_at}
+                                        </td>
+                                        <td className="px-6 py-4 text-right">
+                                            <div className="flex items-center justify-end gap-2">
+                                                <Link
+                                                    href={`/landlord/tenants/${tenant.id}`}
+                                                    className="p-2 text-slate-400 hover:text-primary-main hover:bg-slate-100 rounded-lg transition-colors"
+                                                    title="查看詳情"
+                                                >
+                                                    <Globe className="w-4 h-4" />
+                                                </Link>
+                                                <Link
+                                                    href={`/landlord/tenants/${tenant.id}/edit`}
+                                                    className="p-2 text-slate-400 hover:text-blue-600 hover:bg-slate-100 rounded-lg transition-colors"
+                                                    title="編輯"
+                                                >
+                                                    <Edit className="w-4 h-4" />
+                                                </Link>
+                                                <button
+                                                    onClick={() => setDeleteTarget(tenant)}
+                                                    className="p-2 text-slate-400 hover:text-red-600 hover:bg-red-50 rounded-lg transition-colors"
+                                                    title="刪除"
+                                                >
+                                                    <Trash2 className="w-4 h-4" />
+                                                </button>
+                                            </div>
+                                        </td>
+                                    </tr>
+                                ))
+                            )}
+                        </tbody>
+                    </table>
+                </div>
+            </div>
+
+            {/* Delete Confirmation */}
+            <AlertDialog open={!!deleteTarget} onOpenChange={() => setDeleteTarget(null)}>
+                <AlertDialogContent>
+                    <AlertDialogHeader>
+                        <AlertDialogTitle>確定要刪除這個租戶嗎？</AlertDialogTitle>
+                        <AlertDialogDescription>
+                            刪除租戶將會同時刪除其資料庫和所有資料，此操作無法復原。
+                        </AlertDialogDescription>
+                    </AlertDialogHeader>
+                    <AlertDialogFooter>
+                        <AlertDialogCancel>取消</AlertDialogCancel>
+                        <AlertDialogAction
+                            onClick={handleDelete}
+                            className="bg-red-600 hover:bg-red-700"
+                        >
+                            確定刪除
+                        </AlertDialogAction>
+                    </AlertDialogFooter>
+                </AlertDialogContent>
+            </AlertDialog>
+        </LandlordLayout>
+    );
+}
diff --git a/resources/js/Pages/Landlord/Tenant/Show.tsx b/resources/js/Pages/Landlord/Tenant/Show.tsx
new file mode 100644
index 0000000..aaf9c38
--- /dev/null
+++ b/resources/js/Pages/Landlord/Tenant/Show.tsx
@@ -0,0 +1,165 @@
+import LandlordLayout from "@/Layouts/LandlordLayout";
+import { Link, useForm, router } from "@inertiajs/react";
+import { Globe, Plus, Trash2, ArrowLeft } from "lucide-react";
+import { FormEvent, useState } from "react";
+
+interface Domain {
+    id: number;
+    domain: string;
+}
+
+interface Tenant {
+    id: string;
+    name: string;
+    email: string | null;
+    is_active: boolean;
+    created_at: string;
+    updated_at: string;
+    domains: Domain[];
+}
+
+interface Props {
+    tenant: Tenant;
+}
+
+export default function TenantShow({ tenant }: Props) {
+    const [showAddDomain, setShowAddDomain] = useState(false);
+    const { data, setData, post, processing, errors, reset } = useForm({
+        domain: "",
+    });
+
+    const handleAddDomain = (e: FormEvent) => {
+        e.preventDefault();
+        post(route("landlord.tenants.domains.store", tenant.id), {
+            onSuccess: () => {
+                reset();
+                setShowAddDomain(false);
+            },
+        });
+    };
+
+    const handleRemoveDomain = (domainId: number) => {
+        if (confirm("確定要移除這個域名嗎？")) {
+            router.delete(route("landlord.tenants.domains.destroy", [tenant.id, domainId]));
+        }
+    };
+
+    return (
+        <LandlordLayout title="租戶詳情">
+            <div className="max-w-3xl space-y-6">
+                {/* Back Link */}
+                <Link
+                    href="/landlord/tenants"
+                    className="inline-flex items-center gap-1 text-slate-600 hover:text-slate-900"
+                >
+                    <ArrowLeft className="w-4 h-4" />
+                    返回列表
+                </Link>
+
+                {/* Header */}
+                <div className="flex items-start justify-between">
+                    <div>
+                        <h1 className="text-2xl font-bold text-slate-900">{tenant.name}</h1>
+                        <p className="text-slate-500 mt-1">租戶 ID: {tenant.id}</p>
+                    </div>
+                    <Link
+                        href={`/landlord/tenants/${tenant.id}/edit`}
+                        className="bg-slate-100 hover:bg-slate-200 text-slate-700 px-4 py-2 rounded-lg transition-colors"
+                    >
+                        編輯
+                    </Link>
+                </div>
+
+                {/* Info Card */}
+                <div className="bg-white rounded-xl border border-slate-200 p-6">
+                    <h2 className="text-lg font-semibold text-slate-900 mb-4">基本資訊</h2>
+                    <dl className="grid grid-cols-2 gap-4">
+                        <div>
+                            <dt className="text-sm text-slate-500">狀態</dt>
+                            <dd className="mt-1">
+                                <span
+                                    className={`px-2 py-1 rounded-full text-xs font-medium ${tenant.is_active
+                                            ? "bg-green-100 text-green-700"
+                                            : "bg-slate-100 text-slate-600"
+                                        }`}
+                                >
+                                    {tenant.is_active ? "啟用" : "停用"}
+                                </span>
+                            </dd>
+                        </div>
+                        <div>
+                            <dt className="text-sm text-slate-500">聯絡信箱</dt>
+                            <dd className="mt-1 text-slate-900">{tenant.email || "-"}</dd>
+                        </div>
+                        <div>
+                            <dt className="text-sm text-slate-500">建立時間</dt>
+                            <dd className="mt-1 text-slate-900">{tenant.created_at}</dd>
+                        </div>
+                        <div>
+                            <dt className="text-sm text-slate-500">更新時間</dt>
+                            <dd className="mt-1 text-slate-900">{tenant.updated_at}</dd>
+                        </div>
+                    </dl>
+                </div>
+
+                {/* Domains Card */}
+                <div className="bg-white rounded-xl border border-slate-200 p-6">
+                    <div className="flex items-center justify-between mb-4">
+                        <h2 className="text-lg font-semibold text-slate-900">綁定域名</h2>
+                        <button
+                            onClick={() => setShowAddDomain(!showAddDomain)}
+                            className="text-primary-main hover:text-primary-dark flex items-center gap-1 text-sm"
+                        >
+                            <Plus className="w-4 h-4" />
+                            新增域名
+                        </button>
+                    </div>
+
+                    {showAddDomain && (
+                        <form onSubmit={handleAddDomain} className="mb-4 flex gap-2">
+                            <input
+                                type="text"
+                                value={data.domain}
+                                onChange={(e) => setData("domain", e.target.value)}
+                                placeholder="例如：koori.erp.koori.tw"
+                                className="flex-1 px-4 py-2 border border-slate-300 rounded-lg focus:ring-2 focus:ring-primary-main focus:border-primary-main"
+                            />
+                            <button
+                                type="submit"
+                                disabled={processing}
+                                className="bg-primary-main hover:bg-primary-dark text-white px-4 py-2 rounded-lg disabled:opacity-50"
+                            >
+                                新增
+                            </button>
+                        </form>
+                    )}
+                    {errors.domain && <p className="mb-4 text-sm text-red-500">{errors.domain}</p>}
+
+                    {tenant.domains.length === 0 ? (
+                        <p className="text-slate-500 text-sm">尚未綁定任何域名</p>
+                    ) : (
+                        <ul className="space-y-2">
+                            {tenant.domains.map((domain) => (
+                                <li
+                                    key={domain.id}
+                                    className="flex items-center justify-between p-3 bg-slate-50 rounded-lg"
+                                >
+                                    <div className="flex items-center gap-2">
+                                        <Globe className="w-4 h-4 text-slate-400" />
+                                        <span className="text-slate-900">{domain.domain}</span>
+                                    </div>
+                                    <button
+                                        onClick={() => handleRemoveDomain(domain.id)}
+                                        className="p-1 text-slate-400 hover:text-red-600 hover:bg-red-50 rounded transition-colors"
+                                    >
+                                        <Trash2 className="w-4 h-4" />
+                                    </button>
+                                </li>
+                            ))}
+                        </ul>
+                    )}
+                </div>
+            </div>
+        </LandlordLayout>
+    );
+}
diff --git a/routes/landlord.php b/routes/landlord.php
new file mode 100644
index 0000000..4cac6c5
--- /dev/null
+++ b/routes/landlord.php
@@ -0,0 +1,27 @@
+<?php
+
+use Illuminate\Support\Facades\Route;
+use App\Http\Controllers\Landlord\DashboardController;
+use App\Http\Controllers\Landlord\TenantController;
+
+/*
+|--------------------------------------------------------------------------
+| Landlord Routes (房東後台路由)
+|--------------------------------------------------------------------------
+|
+| 這些路由用於中央管理後台，只能透過 central domain 存取。
+| 用於管理租戶 (新增、編輯、停用) 等系統級操作。
+|
+*/
+
+Route::prefix('landlord')->name('landlord.')->middleware(['web', 'auth'])->group(function () {
+    // 房東儀表板
+    Route::get('/', [DashboardController::class, 'index'])->name('dashboard');
+    
+    // 租戶管理 CRUD
+    Route::resource('tenants', TenantController::class);
+    
+    // 租戶域名管理
+    Route::post('tenants/{tenant}/domains', [TenantController::class, 'addDomain'])->name('tenants.domains.store');
+    Route::delete('tenants/{tenant}/domains/{domain}', [TenantController::class, 'removeDomain'])->name('tenants.domains.destroy');
+});
diff --git a/routes/tenant.php b/routes/tenant.php
new file mode 100644
index 0000000..bc3b131
--- /dev/null
+++ b/routes/tenant.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Support\Facades\Route;
+use Stancl\Tenancy\Middleware\InitializeTenancyByDomain;
+use Stancl\Tenancy\Middleware\PreventAccessFromCentralDomains;
+
+/*
+|--------------------------------------------------------------------------
+| Tenant Routes
+|--------------------------------------------------------------------------
+|
+| 租戶專屬路由。當使用者透過租戶網域 (如 koori.koori-erp.test) 存取時，
+| 會自動初始化租戶 context 並連接到對應的租戶資料庫。
+|
+*/
+
+Route::middleware([
+    'web',
+    InitializeTenancyByDomain::class,
+    PreventAccessFromCentralDomains::class,
+])->group(function () {
+    // 載入與 central 相同的 ERP 路由，但運行在租戶資料庫 context 中
+    require base_path('routes/web.php');
+});