feat: 修正庫存與撥補單邏輯並整合文件

1. 修復倉庫統計數據加總與樣式。
2. 修正可用庫存計算邏輯（排除不可銷售倉庫）。
3. 撥補單商品列表加入批號與效期顯示。
4. 修正撥補單儲存邏輯以支援精確批號轉移。
5. 整合 FEATURES.md 至 README.md。

app/Modules/Inventory/Controllers/ProductController.php

@@ -6,6 +6,7 @@ use App\Http\Controllers\Controller;
 
 use App\Modules\Inventory\Models\Product;
 use App\Modules\Inventory\Models\Unit;
+use App\Modules\Inventory\Models\Category;
 use Illuminate\Http\Request;
 use Inertia\Inertia;
 use Inertia\Response;
@@ -13,7 +14,7 @@ use Inertia\Response;
 class ProductController extends Controller
 {
     /**
-     * Display a listing of the resource.
+     * 顯示資源列表。
      */
     public function index(Request $request): Response
     {
@@ -40,7 +41,7 @@ class ProductController extends Controller
         $sortField = $request->input('sort_field', 'id');
         $sortDirection = $request->input('sort_direction', 'desc');
         
-        // Define allowed sort fields to prevent SQL injection
+        // 定義允許的排序欄位以防止 SQL 注入
         $allowedSorts = ['id', 'code', 'name', 'category_id', 'base_unit_id', 'conversion_rate'];
         if (!in_array($sortField, $allowedSorts)) {
             $sortField = 'id';
@@ -49,11 +50,11 @@ class ProductController extends Controller
             $sortDirection = 'desc';
         }
 
-        // Handle relation sorting (category name) separately if needed, or simple join
+        // 如果需要，分別處理關聯排序（分類名稱），或簡單的 join
         if ($sortField === 'category_id') {
-            // Join categories for sorting by name? Or just by ID?
-            // Simple approach: sort by ID for now, or join if user wants name sort.
-            // Let's assume standard field sorting first.
+            // 加入分類以便按名稱排序？還是僅按 ID？
+            // 簡單方法：目前按 ID 排序，如果使用者想要按名稱排序則 join。
+            // 先假設標準欄位排序。
             $query->orderBy('category_id', $sortDirection);
         } else {
              $query->orderBy($sortField, $sortDirection);
@@ -61,18 +62,49 @@ class ProductController extends Controller
 
         $products = $query->paginate($perPage)->withQueryString();
 
-        $categories = \App\Modules\Inventory\Models\Category::where('is_active', true)->get();
+        $products->getCollection()->transform(function ($product) {
+            return (object) [
+                'id' => (string) $product->id,
+                'code' => $product->code,
+                'name' => $product->name,
+                'categoryId' => $product->category_id,
+                'category' => $product->category ? (object) [
+                    'id' => $product->category->id,
+                    'name' => $product->category->name,
+                ] : null,
+                'brand' => $product->brand,
+                'specification' => $product->specification,
+                'baseUnitId' => $product->base_unit_id,
+                'baseUnit' => $product->baseUnit ? (object) [
+                    'id' => $product->baseUnit->id,
+                    'name' => $product->baseUnit->name,
+                ] : null,
+                'largeUnitId' => $product->large_unit_id,
+                'largeUnit' => $product->largeUnit ? (object) [
+                    'id' => $product->largeUnit->id,
+                    'name' => $product->largeUnit->name,
+                ] : null,
+                'purchaseUnitId' => $product->purchase_unit_id,
+                'purchaseUnit' => $product->purchaseUnit ? (object) [
+                    'id' => $product->purchaseUnit->id,
+                    'name' => $product->purchaseUnit->name,
+                ] : null,
+                'conversionRate' => (float) $product->conversion_rate,
+            ];
+        });
+
+        $categories = Category::where('is_active', true)->get();
 
         return Inertia::render('Product/Index', [
             'products' => $products,
-            'categories' => $categories,
-            'units' => Unit::all(),
+            'categories' => Category::where('is_active', true)->get()->map(fn($c) => (object)['id' => $c->id, 'name' => $c->name]),
+            'units' => Unit::all()->map(fn($u) => (object)['id' => (string) $u->id, 'name' => $u->name, 'code' => $u->code]),
             'filters' => $request->only(['search', 'category_id', 'per_page', 'sort_field', 'sort_direction']),
         ]);
     }
 
     /**
-     * Store a newly created resource in storage.
+     * 將新建立的資源儲存到儲存體中。
      */
     public function store(Request $request)
     {
@@ -107,7 +139,7 @@ class ProductController extends Controller
     }
 
     /**
-     * Update the specified resource in storage.
+     * 更新儲存體中的指定資源。
      */
     public function update(Request $request, Product $product)
     {
@@ -141,7 +173,7 @@ class ProductController extends Controller
     }
 
     /**
-     * Remove the specified resource from storage.
+     * 從儲存體中移除指定資源。
      */
     public function destroy(Product $product)
     {