feat(trace): support external trace id propagation (langgenius#22623)

Co-authored-by: Copilot <[email protected]>

Author: 2 people

api/core/ops/ops_trace_manager.py

@@ -539,6 +539,10 @@ def workflow_trace(
                 "app_id": workflow_run.app_id,
             }
 
+            external_trace_id = self.kwargs.get("external_trace_id")
+            if external_trace_id:
+                metadata["external_trace_id"] = external_trace_id
+
             workflow_trace_info = WorkflowTraceInfo(
                 trace_id=self.trace_id,
                 workflow_data=workflow_run.to_dict(),