This commit adds multiple major features and improvements:
1. Add runtime config API with save/reset capabilities
2. Implement per-room distributor override with global fallback
3. Add user management page and inline user controls
4. Update auth policy with admin/root permissions
5. Refine frontend navigation and error boundary
6. Update static assets and build system
7. Add CDN/SRS/Cloudflare config apply logic
noelorin