feat(infrastructure): use celery worker

backend/app/services/user_service.py

@@ -7,8 +7,8 @@ from fastapi_users import BaseUserManager, FastAPIUsers, UUIDIDMixin
 from fastapi_users.authentication import (
     AuthenticationBackend,
     BearerTransport,
-    JWTStrategy,
 )
+from fastapi_users.authentication.strategy.jwt import JWTStrategy
 from fastapi_users.db import SQLAlchemyUserDatabase
 
 from app.models.user import User
@@ -47,7 +47,7 @@ class UserManager(UUIDIDMixin, BaseUserManager[User, uuid.UUID]):
         )
         try:
             enqueue_email(to=user.email, subject=subject, body=body)
-        except Exception:
+        except Exception as e:
             print("[Email Fallback] To:", user.email)
             print("[Email Fallback] Subject:", subject)
             print("[Email Fallback] Body:\n", body)