feat(product): 移除商品起停用功能，後端預設所有商品為啟用狀態

app/Modules/Inventory/Controllers/ProductController.php

@@ -152,7 +152,6 @@ class ProductController extends Controller
                 'price' => (float) $product->price,
                 'member_price' => (float) $product->member_price,
                 'wholesale_price' => (float) $product->wholesale_price,
-                'is_active' => (bool) $product->is_active,
             ]
         ]);
     }