refactor: 重構 VendorProduct API 與新增進貨單重複檢查前端邏輯

1. 將 VendorProductController 中的 Eloquent 關聯操作改為透過 ProcurementService 使用 DB 操作，解除跨模組 Model 直接依賴。
2. ProcurementService 加入 vendor product 的資料存取方法。
3. 進貨單建立前端 (GoodsReceipt/Create.tsx) 新增重複進貨檢查與警告對話框邏輯。

app/Modules/Inventory/Controllers/GoodsReceiptController.php

@@ -8,6 +8,7 @@ use App\Modules\Inventory\Services\InventoryService;
 use App\Modules\Procurement\Contracts\ProcurementServiceInterface;
 use Illuminate\Http\Request;
 use App\Modules\Procurement\Models\Vendor;
+use App\Modules\Inventory\Services\DuplicateCheckService;
 use Inertia\Inertia;
 use App\Modules\Inventory\Models\GoodsReceipt;
 use Illuminate\Support\Facades\DB;
@@ -17,15 +18,18 @@ class GoodsReceiptController extends Controller
     protected $goodsReceiptService;
     protected $inventoryService;
     protected $procurementService;
+    protected $duplicateCheckService;
 
     public function __construct(
         GoodsReceiptService $goodsReceiptService,
         InventoryService $inventoryService,
-        ProcurementServiceInterface $procurementService
+        ProcurementServiceInterface $procurementService,
+        DuplicateCheckService $duplicateCheckService
     ) {
         $this->goodsReceiptService = $goodsReceiptService;
         $this->inventoryService = $inventoryService;
         $this->procurementService = $procurementService;
+        $this->duplicateCheckService = $duplicateCheckService;
     }
 
     public function index(Request $request)
@@ -159,10 +163,6 @@ class GoodsReceiptController extends Controller
             'warehouse_id' => 'required|exists:warehouses,id',
             'type' => 'required|in:standard,miscellaneous,other',
             'purchase_order_id' => 'nullable|required_if:type,standard|exists:purchase_orders,id',
-            // Vendor ID is required if standard, but optional/nullable for misc/other? 
-            // Stick to existing logic: if standard, we infer vendor from PO usually, or frontend sends it.
-            // For now let's make vendor_id optional for misc/other or user must select one?
-            // "雜項入庫" might not have a vendor. Let's make it nullable.
             'vendor_id' => 'nullable|integer',
             'received_date' => 'required|date',
             'remarks' => 'nullable|string',
@@ -173,6 +173,7 @@ class GoodsReceiptController extends Controller
             'items.*.unit_price' => 'required|numeric|min:0',
             'items.*.batch_number' => 'nullable|string',
             'items.*.expiry_date' => 'nullable|date',
+            'force' => 'nullable|boolean',
         ]);
 
         try {
@@ -183,6 +184,15 @@ class GoodsReceiptController extends Controller
         }
     }
 
+    /**
+     * 預檢重複進貨 API
+     */
+    public function checkDuplicate(Request $request)
+    {
+        $result = $this->duplicateCheckService->checkDuplicateReceipt($request->all());
+        return response()->json($result);
+    }
+
     public function submit(GoodsReceipt $goodsReceipt)
     {
         if (!auth()->user()->can('goods_receipts.edit')) {