feat: add workflow action outcomes and tracing

backend/services/pipecat/pipeline.py

@@ -208,8 +208,9 @@ async def run_pipeline(
                    只要有 .input() / .output() / event_handler 即可。
         cfg:       助手配置(随请求内联传入)。
     """
-    if cfg.type == "workflow":
-        vision_enabled = WorkflowEngine(cfg.graph).uses_vision()
+    workflow_engine = WorkflowEngine(cfg.graph) if cfg.type == "workflow" else None
+    if workflow_engine:
+        vision_enabled = workflow_engine.uses_vision()
 
     logger.info(
         f"启动管线: assistant={cfg.name} type={cfg.type} "
@@ -578,6 +579,7 @@ async def run_pipeline(
         channel=channel,
         runtime_mode=cfg.runtimeMode,
         session_id=cfg.conversation_id or None,
+        extra=(workflow_engine.session_metadata() if workflow_engine else None),
     )
     pipeline = Pipeline(
         [
@@ -664,6 +666,7 @@ async def run_pipeline(
             set_system_prompt=set_system_prompt,
             set_tools=set_visible_tools,
             call_end=call_end,
+            session_id=recorder.session_id if recorder else "",
             client_tools=client_tools,
             worker=worker,
             context_aggregator=WorkflowAggregatorPair(