{"ok":true,"message":"清泉·飞书邮件助手后端（IMAP轮询+飞书表+人审回信）。浏览器打开根路径显示 JSON 属正常，业务在飞书多维表格与飞书卡片里。","service":"qingquan-mail-assistant","tenant":"清泉","version":"0.2.0","docs":"/docs","health":"/health","mailboxes":4,"poller_in_this_process":false,"note":"生产轮询由 systemd 单元 qingquan-mail-assistant(main.py) 负责；本进程默认只提供 HTTP。"}