- Add AdminMenuConfig model for per-platform menu customization
- Add menu registry for centralized menu configuration
- Add my-menu-config and platform-menu-config admin pages
- Update sidebar with improved layout and Alpine.js interactions
- Add FrontendType enum for admin/vendor menu separation
- Document self-contained module patterns in session note
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>