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

backend/apps/catalog/urls.py

@@ -0,0 +1,17 @@
+"""商品中心 URL。"""
+
+from django.urls import path, include
+from adrf.routers import DefaultRouter as ADRouter
+from .views import CategoryViewSet, BrandViewSet, UnitViewSet, ProductViewSet
+
+
+router = ADRouter()
+router.register("categories", CategoryViewSet, basename="category")
+router.register("brands", BrandViewSet, basename="brand")
+router.register("units", UnitViewSet, basename="unit")
+router.register("products", ProductViewSet, basename="product")
+
+
+urlpatterns = [
+    path("", include(router.urls)),
+]