optim: optim import and some email key

src/backend/email_notice/services.py

@@ -1,8 +1,9 @@
-from django.core.mail import send_mail
-from django.conf import settings
 import json
 import logging
 
+from django.conf import settings
+from django.core.mail import send_mail
+
 logger = logging.getLogger(__name__)
 
 class EmailNotificationService: