Feat: Fixed the issue where some fields in the chat configuration could not be displayed #3221 (#9430)

### What problem does this PR solve?

Feat: Fixed the issue where some fields in the chat configuration could
not be displayed #3221
### Type of change


- [x] New Feature (non-breaking change which adds functionality)

api/db/services/dialog_service.py

@@ -121,6 +121,7 @@ class DialogService(CommonService):
             cls.model.do_refer,
             cls.model.rerank_id,
             cls.model.kb_ids,
+            cls.model.icon,
             cls.model.status,
             User.nickname,
             User.avatar.alias("tenant_avatar"),