baseline: 批次A-D 成果 + membership 半成品（测试红）

backend/apps/sales/urls.py

@@ -0,0 +1,15 @@
+"""sales URL。"""
+
+from django.urls import path, include
+from adrf.routers import DefaultRouter as ADRouter
+from .views import SalesOrderViewSet, SalesBillViewSet
+
+
+router = ADRouter()
+router.register("orders", SalesOrderViewSet, basename="so")
+router.register("bills", SalesBillViewSet, basename="sb")
+
+
+urlpatterns = [
+    path("", include(router.urls)),
+]