- Add WeChat service for OAuth2 authentication flow - Add WeChat routes (/api/wechat/login, /api/wechat/callback) - Add WeChat types for login state and responses - Update EntryQRCode component to support WeChat login - Add WeChat config options (appId, appSecret, redirectUri) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>