feat: add API route for serving images with path validation

frontend/next.config.js

@@ -1,6 +1,14 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
   output: 'standalone',
+  async rewrites() {
+    return [
+      {
+        source: '/images/:filename',
+        destination: '/api/images/:filename',
+      },
+    ];
+  },
 };
 
 module.exports = nextConfig;