feat: custom app icon (#7196)

Co-authored-by: crazywoola <427733928@qq.com>

api/events/event_handlers/create_site_record_when_app_created.py

@@ -11,6 +11,7 @@ def handle(sender, **kwargs):
     site = Site(
         app_id=app.id,
         title=app.name,
+        icon_type=app.icon_type,
         icon=app.icon,
         icon_background=app.icon_background,
         default_language=account.interface_language,