获取系统信息 get_sys_info

{
  "code": 0,
  "message": "string",
  "data": {
    "audio": {
      "wait_play_audio_num": 0,
      "wait_synthesis_msg_num": 0
    },
    "metahuman-stream": {
      "wait_play_audio_num": 0,
      "wait_synthesis_msg_num": 0
    }
  }
}