Initial commit: accountbook project

- Node.js backend server
- Frontend application
- Backup script
- Project specification

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/next.config.js

@@ -0,0 +1,13 @@
+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  async rewrites() {
+    return [
+      {
+        source: '/api/:path*',
+        destination: 'http://localhost:3501/api/:path*',
+      },
+    ];
+  },
+};
+
+module.exports = nextConfig;