optimize app list desc

api/fields/app_fields.py

@@ -64,7 +64,7 @@ model_config_partial_fields = {
 app_partial_fields = {
     'id': fields.String,
     'name': fields.String,
-    'description': fields.String,
+    'description': fields.String(attribute='desc_or_prompt'),
     'mode': fields.String,
     'icon': fields.String,
     'icon_background': fields.String,

api/models/model.py

@@ -76,6 +76,17 @@ class App(db.Model):
     created_at = db.Column(db.DateTime, nullable=False, server_default=db.text('CURRENT_TIMESTAMP(0)'))
     updated_at = db.Column(db.DateTime, nullable=False, server_default=db.text('CURRENT_TIMESTAMP(0)'))
 
+    @property
+    def desc_or_prompt(self):
+        if self.description:
+            return self.description
+        else:
+            app_model_config = self.app_model_config
+            if app_model_config:
+                return app_model_config.pre_prompt
+            else:
+                return ''
+
     @property
     def site(self):
         site = db.session.query(Site).filter(Site.app_id == self.id).first()