feat: ADRF async views (phase1) + native async serializers (phase2) + async cache infra

user/views/region.py

@@ -1,5 +1,5 @@
 from rest_framework.permissions import AllowAny
-from rest_framework.views import APIView
+from adrf.views import APIView
 from rest_framework.response import Response
 from rest_framework import status
 from drf_yasg.utils import swagger_auto_schema
@@ -59,7 +59,7 @@ class RegionListView(APIView):
             ),
         }
     )
-    def get(self, request):
+    async def get(self, request):
         level = request.GET.get('level')
         parent_code = request.GET.get('parent_code')
 
@@ -78,7 +78,8 @@ class RegionListView(APIView):
         else:
             queryset = queryset.filter(level=1)
 
-        serializer = RegionSimpleSerializer(queryset, many=True)
+        regions = [r async for r in queryset]
+        serializer = RegionSimpleSerializer(regions, many=True)
         return Response(
             {"code": 200, "message": "success", "data": serializer.data},
             status=status.HTTP_200_OK