fix(api): fix transparent upgrade SSE channel mismatch and chat mode routing

- workflow_execute_task: add AppMode.CHAT/AGENT_CHAT/COMPLETION to the
  AdvancedChatAppGenerator routing branch so transparently upgraded old
  apps can execute through the workflow engine.
- app_generate_service: use app_model.mode (not hardcoded AppMode.AGENT)
  for SSE event subscription channel, ensuring the subscriber and
  Celery publisher use the same Redis channel key.

Made-with: Cursor

api/services/app_generate_service.py

@@ -165,10 +165,11 @@ class AppGenerateService:
 
                         on_subscribe = cls._build_streaming_task_on_subscribe(on_subscribe)
                         generator = AdvancedChatAppGenerator()
+                        subscribe_mode = AppMode.value_of(app_model.mode)
                         return rate_limit.generate(
                             generator.convert_to_event_stream(
                                 generator.retrieve_events(
-                                    AppMode.AGENT,
+                                    subscribe_mode,
                                     payload.workflow_run_id,
                                     on_subscribe=on_subscribe,
                                 ),

api/tasks/app_generate/workflow_execute_task.py

@@ -183,7 +183,13 @@ class _AppRunner:
         pause_state_config: PauseStateLayerConfig,
     ):
         exec_params = self._exec_params
-        if exec_params.app_mode in {AppMode.ADVANCED_CHAT, AppMode.AGENT}:
+        if exec_params.app_mode in {
+            AppMode.ADVANCED_CHAT,
+            AppMode.AGENT,
+            AppMode.CHAT,
+            AppMode.AGENT_CHAT,
+            AppMode.COMPLETION,
+        }:
             return AdvancedChatAppGenerator().generate(
                 app_model=app,
                 workflow=workflow,