feishu-login

Log the user in to Feishu (飞书登录 / 飞书授权 / 扫码登录 / 重新授权) for every plugin that works in Feishu as the user: check the login, and when it is missing or has lapsed, hand the user a QR code to scan with the Feishu phone app (one scan, done in the user's own hidden browser) and collect the login. Other plugins' skills (requirement-auto, gof-ad-audit) send their Feishu login here; also use it when the user asks about or wants to redo their Feishu login, or to log out.