feat: rebuild fiscal clone architecture and harden coolify deployment

frontend/next.config.js

@@ -4,7 +4,19 @@ const nextConfig = {
   output: 'standalone',
   env: {
     NEXT_PUBLIC_API_URL: process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3001'
+  },
+  async headers() {
+    return [
+      {
+        source: '/auth/:path*',
+        headers: [
+          { key: 'Cache-Control', value: 'no-store, no-cache, max-age=0, must-revalidate' },
+          { key: 'Pragma', value: 'no-cache' },
+          { key: 'Expires', value: '0' }
+        ]
+      }
+    ];
   }
 }
 
-module.exports = nextConfig
+module.exports = nextConfig;