Refactor code structure for improved readability and maintainability

frontend/next.config.ts

@@ -0,0 +1,16 @@
+import type { NextConfig } from 'next';
+
+const nextConfig: NextConfig = {
+  images: {
+    remotePatterns: [
+      {
+        protocol: 'https',
+        hostname: 'images.unsplash.com',
+        port: '',
+        pathname: '/**',
+      },
+    ],
+  },
+};
+
+export default nextConfig;