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

backend/apps/purchase/urls.py

@@ -0,0 +1,15 @@
+"""purchase URL。"""
+
+from django.urls import path, include
+from adrf.routers import DefaultRouter as ADRouter
+from .views import PurchaseOrderViewSet, PurchaseBillViewSet
+
+
+router = ADRouter()
+router.register("orders", PurchaseOrderViewSet, basename="po")
+router.register("bills", PurchaseBillViewSet, basename="pb")
+
+
+urlpatterns = [
+    path("", include(router.urls)),
+]