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

user/views/phone.py

@@ -1,6 +1,7 @@
 from rest_framework import status
-from rest_framework.views import APIView
+from adrf.views import APIView
 from rest_framework.permissions import IsAuthenticated
+from asgiref.sync import sync_to_async
 
 from utils.response_codes import (
     ResponseCode,
@@ -17,13 +18,14 @@ from ..serializers.user_serializers import (
 class SendPhoneCodeAPIView(APIView):
     permission_classes = [IsAuthenticated]
 
-    def post(self, request):
+    async def post(self, request):
         serializer = SendPhoneCodeSerializer(
             data=request.data,
             context={'request': request}
         )
 
-        if not serializer.is_valid():
+        # 校验/save 内含 cache 写入，线程池兜底
+        if not await sync_to_async(serializer.is_valid)():
             errors = serializer.errors
             first_error = ''
             for field, msgs in errors.items():
@@ -39,7 +41,7 @@ class SendPhoneCodeAPIView(APIView):
             )
 
         try:
-            phone = serializer.save()
+            phone = await sync_to_async(serializer.save)()
             return create_standardized_response(
                 data={'phone_sent': True},
                 code=ResponseCode.SUCCESS,
@@ -56,13 +58,14 @@ class SendPhoneCodeAPIView(APIView):
 class ChangePhoneAPIView(APIView):
     permission_classes = [IsAuthenticated]
 
-    def post(self, request):
+    async def post(self, request):
         serializer = ChangePhoneSerializer(
             data=request.data,
             context={'request': request}
         )
 
-        if not serializer.is_valid():
+        # 校验/save 内含 cache 读写与 user.save() ORM 调用，线程池兜底
+        if not await sync_to_async(serializer.is_valid)():
             errors = serializer.errors
             first_error = ''
             for field, msgs in errors.items():
@@ -78,7 +81,7 @@ class ChangePhoneAPIView(APIView):
             )
 
         try:
-            updated_user = serializer.save()
+            updated_user = await sync_to_async(serializer.save)()
             user_serializer = UserSerializer(updated_user)
 
             return create_standardized_response(