fix: published workflow(tool) can be deleted. (#17900)

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/services/workflow_service.py

@@ -515,5 +515,10 @@ class WorkflowService:
             # Cannot delete a workflow that's currently in use by an app
             raise WorkflowInUseError(f"Cannot delete workflow that is currently in use by app '{app.name}'")
 
+        # Check if this workflow is published as a tool
+        if workflow.tool_published:
+            # Cannot delete a workflow that's published as a tool
+            raise WorkflowInUseError("Cannot delete workflow that is published as a tool")
+
         session.delete(workflow)
         return True