chore: initial commit of Wagtail backend scaffold

apps/api/apps.py

@@ -0,0 +1,8 @@
+from django.apps import AppConfig
+
+
+class ApiConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "apps.api"
+    label = "api"
+    verbose_name = "API"

apps/api/urls.py

@@ -0,0 +1,14 @@
+"""
+Wagtail API v2 路由配置。
+详见 documents/设计方案分析与完善版.md §2.7 Headless API 设计规范。
+"""
+from wagtail.api.v2.views import PagesAPIViewSet
+from wagtail.api.v2.router import WagtailAPIRouter
+from wagtail.images.api.v2.views import ImagesAPIViewSet
+from wagtail.documents.api.v2.views import DocumentsAPIViewSet
+
+api_router = WagtailAPIRouter("wagtailapi")
+
+api_router.register_endpoint("pages", PagesAPIViewSet)
+api_router.register_endpoint("images", ImagesAPIViewSet)
+api_router.register_endpoint("documents", DocumentsAPIViewSet)