[REFACTOR] 優化資料庫查詢效能：在多個 Service 與 Controller 中加入 select 欄位限制，並新增租戶資料表索引 Migration。

app/Modules/Inventory/Controllers/SafetyStockController.php

@@ -19,7 +19,7 @@ class SafetyStockController extends Controller
      */
     public function index(Warehouse $warehouse)
     {
-        $allProducts = Product::with(['category', 'baseUnit'])->get();
+        $allProducts = Product::select('id', 'name', 'category_id', 'base_unit_id')->with(['category:id,name', 'baseUnit:id,name'])->get();
 
         // 準備可選商品列表
         $availableProducts = $allProducts->map(function ($product) {