Next.js + Mantine mock SSO service providing account/password, phone
verify-code, and Feishu QR login. Issues a one-time sso_code that the
external app exchanges for user info.
Includes:
- Feishu callback fix: guard against duplicate/concurrent /api/login
submissions of the same single-use authorization code (feishuLogin
once-guard + memoized onLoginSuccess to stop effect re-fire).
- ADAPTATION_GUIDE.md: how to switch from the in-memory code store to
the real backend auth/index + inner_get_user_info endpoints.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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