Major features:
- feat(auth): add TOTP (2FA) support for enhanced security
- feat(auth): add password reset functionality
- feat(openai): improve rate limit handling with reset time tracking
- feat(subscription): add expiry notification service
- fix(urlvalidator): remove trailing slash from validated URLs
- docs: update demo site domain
Resolved conflicts:
- deploy/docker-compose.yml: added TOTP_ENCRYPTION_KEY config
- setting_service.go: keep TianShuAPI site name while adding new features
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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