feat: support configurable CORS proxy server (#383)

src/hooks/useFetchWebMetadata.tsx

@@ -4,6 +4,10 @@ import webService from '@/services/web.service'
 
 export function useFetchWebMetadata(url: string) {
   const [metadata, setMetadata] = useState<TWebMetadata>({})
+  const proxyServer = import.meta.env.VITE_PROXY_SERVER
+  if (proxyServer) {
+    url = `${proxyServer}/sites/${encodeURIComponent(url)}` 
+  }
 
   useEffect(() => {
     webService.fetchWebMetadata(url).then((metadata) => setMetadata(metadata))