fix(api): add support for "image" icon when duplicate app (#20744)

- Extend valid options for icon_type_value in AppDslService to include "image"
- Now supports three types of application icons: "emoji", "link", and "image" when duplicate app

api/services/app_dsl_service.py

@@ -421,7 +421,7 @@ class AppDslService:
 
         # Set icon type
         icon_type_value = icon_type or app_data.get("icon_type")
-        if icon_type_value in ["emoji", "link"]:
+        if icon_type_value in ["emoji", "link", "image"]:
             icon_type = icon_type_value
         else:
             icon_type = "emoji"