* feat(frontend): add customizable favicon and corner logo with live preview
- Add app_logo and app_favicon config fields in config page
- Implement BrandLogo component with URL fallback to SVG logo
- Integrate BrandLogo into all layouts (admin, h5, h5-simple) and navbar
- Add real-time preview for favicon and logo in config page with error state
- Support both relative paths and full image URLs for branding assets
- Sync branding changes (app_name/app_logo/app_favicon) to site config on save
* fix(frontend): preserve tunnel node selection order
* fix(select): use useMemo for option label map to improve performance