{"thread_id":null,"message":"Q&A Analysis API service with unified LangGraph","version":"1.4","endpoints":{"/chat":"多轮对话（共享历史)","/qa/analyze":"错误分析（共享历史)","/tags":"知识点标签提取（共享历史)","/ask":"基于历史生成反问","/clear_thread":"清理会话历史，complete=true 时先总结","/health":"服务健康检查"}}