chore: 完善模組化架構遷移與修復前端顯示錯誤

- 修正所有模組 Controller 的 Model 引用路徑 (App\Modules\...)
- 更新 ProductionOrder 與 ProductionOrderItem 模型結構以符合新版邏輯
- 修復 resources/js/utils/format.ts 在處理空值時導致 toLocaleString 崩潰的問題
- 清除全域路徑與 Controller 遷移殘留檔案

app/Http/Controllers/Landlord/DashboardController.php

@@ -3,7 +3,7 @@
 namespace App\Http\Controllers\Landlord;
 
 use App\Http\Controllers\Controller;
-use App\Models\Tenant;
+use App\Modules\Core\Models\Tenant;
 use Inertia\Inertia;
 
 class DashboardController extends Controller

app/Http/Controllers/Landlord/TenantController.php

@@ -3,7 +3,7 @@
 namespace App\Http\Controllers\Landlord;
 
 use App\Http\Controllers\Controller;
-use App\Models\Tenant;
+use App\Modules\Core\Models\Tenant;
 use Illuminate\Http\Request;
 use Illuminate\Validation\Rule;
 use Inertia\Inertia;