feat: add next.config rewrites for shortlink routing and show domain in UI

client/next.config.ts

@@ -1,8 +1,15 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-
   output: 'standalone',
+  async rewrites() {
+    return [
+      {
+        source: '/l/:slug',
+        destination: `${process.env.INTERNAL_BACKEND_URL || 'http://localhost:4001'}/l/:slug`
+      }
+    ];
+  }
 };
 
 export default nextConfig;