REFACTOR(repo): simplify project structure

- Move services/nextjs to nextjs/
- Move deploy/docker/Dockerfile.prod to Dockerfile
- Add GitHub Actions workflows (ci.yml, build.yml)
- Remove deploy/, services/, scripts/ folders

nextjs/next.config.mjs

@@ -0,0 +1,48 @@
+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  // Enable standalone output for Docker
+  output: 'standalone',
+  
+  // Optimize for Docker
+  outputFileTracingRoot: '/app',
+
+  // Image optimization
+  images: {
+    remotePatterns: [
+      {
+        protocol: 'https',
+        hostname: '**',
+      },
+    ],
+  },
+
+  // API configuration
+  async headers() {
+    return [
+      {
+        source: '/api/:path*',
+        headers: [
+          {
+            key: 'Cache-Control',
+            value: 'no-store, max-age=0',
+          },
+        ],
+      },
+    ];
+  },
+
+  // Webpack configuration for Docker
+  webpack: (config, { isServer }) => {
+    if (!isServer) {
+      config.resolve.fallback = {
+        ...config.resolve.fallback,
+        fs: false,
+        net: false,
+        tls: false,
+      };
+    }
+    return config;
+  },
+};
+
+export default nextConfig;