Refactor code structure for improved readability and maintainability

app/frontend/next.config.js

@@ -0,0 +1,13 @@
+const withPWA = require('next-pwa')({
+  dest: 'public',
+  register: true,
+  skipWaiting: true,
+  disable: process.env.NODE_ENV === 'development',
+})
+
+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  reactStrictMode: true,
+}
+
+module.exports = withPWA(nextConfig)