feat(frontend): add customizable favicon and corner logo with live preview (#218)

* 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

vite-frontend/src/components/navbar.tsx

@@ -7,7 +7,7 @@ import {
   NavbarBrand,
   NavbarContent,
 } from "@/shadcn-bridge/heroui/navbar";
-import { Logo } from "@/components/icons";
+import { BrandLogo } from "@/components/brand-logo";
 import { siteConfig, getCachedConfig } from "@/config/site";
 import { useWebViewMode } from "@/hooks/useWebViewMode";
 
@@ -69,7 +69,7 @@ export const Navbar = () => {
               color="foreground"
               href="/"
             >
-              <Logo size={24} />
+              <BrandLogo size={24} />
               <p className="font-bold text-inherit truncate">{appName}</p>
             </Link>
           </NavbarBrand>