FEAT(config): add /portfolio basepath

- Set basePath to '/portfolio' for proper path-based routing
- Set assetPrefix to '/portfolio' for static asset loading
- This allows the app to work correctly under /portfolio path

services/nextjs/next.config.ts

@@ -2,6 +2,8 @@ import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
   output: 'standalone',
+  basePath: '/portfolio',
+  assetPrefix: '/portfolio',
 };
 
 export default nextConfig;