- Add GitHub OAuth 2.0 authentication flow
- Create authentication routes: /auth/login, /auth/callback, /auth/logout
- Implement OAuth server utilities with proper session management
- Add authentication hooks and client-side state management
- Update header with login/logout controls and user menu
- Create user profile page with GitHub integration
- Add environment variables for GitHub OAuth configuration
- Include comprehensive documentation for setup and usage
- Enhance profile store with authentication state
- Add authentication status API endpoint
Closes: GitHub authentication implementation
