optim: optim import and some email key

src/backend/email_notice/admin.py

@@ -1,6 +1,8 @@
 from django.contrib import admin
+
 from .models import NotificationEmail, NotificationSettings
 
+
 @admin.register(NotificationEmail)
 class NotificationEmailAdmin(admin.ModelAdmin):
     list_display = ('email', 'is_enabled', 'description', 'created_at')