[REFACTOR] 統一訂單同步 API 錯誤回應與修正 Linter 警告

app/Modules/Integration/Requests/SyncOrderRequest.php

@@ -27,7 +27,8 @@ class SyncOrderRequest extends FormRequest
             'payment_method' => 'nullable|string|in:cash,credit_card,line_pay,ecpay,transfer,other',
             'sold_at' => 'nullable|date',
             'items' => 'required|array|min:1',
-            'items.*.pos_product_id' => 'required|string',
+            'items.*.product_id' => 'required|integer',
+            'items.*.batch_number' => 'nullable|string',
             'items.*.qty' => 'required|numeric|min:0.0001',
             'items.*.price' => 'required|numeric|min:0',
         ];