feat(core): add core module with mixins, services, and background jobs

- Add Model Mixins: TimestampMixin, SoftDeleteMixin, AuditMixin, etc.
- Add Base Services: BaseService, BulkOperationsMixin, QueryOptimizerMixin
- Add Base ViewSets with bulk operations
- Add BackgroundJob model for Celery task tracking
- Add BaseAppCommand for management commands
- Add permissions, pagination, filters, cache, logging
- Migrate tests to factory_boy + faker
- Add CHANGELOG.md
- 297 tests passing

src/apps/user/views.py

@@ -147,12 +147,8 @@ class UserUpdateView(APIView):
         serializer = UserUpdateSerializer(request.user, data=request.data, partial=True)
         if serializer.is_valid():
             user = UserService.update_user(request.user.id, **serializer.validated_data)
-            if user:
-                user_serializer = UserSerializer(user)
-                return Response(user_serializer.data)
-            return Response(
-                {"error": "Пользователь не найден"}, status=status.HTTP_404_NOT_FOUND
-            )
+            user_serializer = UserSerializer(user)
+            return Response(user_serializer.data)
         return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
 
 
@@ -163,7 +159,7 @@ class ProfileDetailView(generics.RetrieveUpdateAPIView):
     serializer_class = ProfileUpdateSerializer
 
     def get_object(self):
-        profile = ProfileService.get_profile_by_user_id(self.request.user.id)
+        profile = ProfileService.get_profile_by_user_id_or_none(self.request.user.id)
         if not profile:
             # Если профиль не существует, создаем его
             from .models import Profile
@@ -206,11 +202,7 @@ class ProfileDetailView(generics.RetrieveUpdateAPIView):
             updated_profile = ProfileService.update_profile(
                 request.user.id, **serializer.validated_data
             )
-            if updated_profile:
-                return Response(ProfileUpdateSerializer(updated_profile).data)
-            return Response(
-                {"error": "Профиль не найден"}, status=status.HTTP_404_NOT_FOUND
-            )
+            return Response(ProfileUpdateSerializer(updated_profile).data)
         return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
 
 
@@ -259,9 +251,7 @@ class PasswordChangeView(APIView):
 def user_profile_detail(request):
     """Получение полных данных профиля пользователя"""
     profile_data = ProfileService.get_full_profile_data(request.user.id)
-    if profile_data:
-        return Response(profile_data)
-    return Response({"error": "Профиль не найден"}, status=status.HTTP_404_NOT_FOUND)
+    return Response(profile_data)
 
 
 class TokenRefreshView(APIView):