fix: added merchant_id to printing_order and plate_order

api_v1/urls.py

@@ -25,6 +25,7 @@ from .views.products import ProductQuickViewSet
 from .views.parameters import StateParameterViewSet
 from .views.users import CreateUserWithProfileView
 from .views.mingdaoyun import MDYPlateOrderStagingViewSet
+from .views.shipment import SalesItemByPrintingOrderView
 
 # 创建 DRF Router for Stateflow
 stateflow_router = DefaultRouter()
@@ -98,6 +99,13 @@ urlpatterns = [
     # Stateflow API (使用 Router)
     path('stateflow/', include(stateflow_router.urls)),
     
+    # Shipment API
+    path(
+        'shipment/sales-items/by-printing-order/<int:printing_order_id>/',
+        SalesItemByPrintingOrderView.as_view(),
+        name='sales_items_by_printing_order'
+    ),
+    
     # 主 Router (printing-orders 等)
     path('', include(main_router.urls)),
 ]