Fix Next.js API route for Amplify WEB_COMPUTE platform

- Add .env.production for Amplify environment variable mapping
- Update artifacts configuration for WEB_COMPUTE platform
- Add explicit nodejs runtime for API route
- Enable serverActions in Next.js config
- Add debugging output for environment variables

🤖 Generated with [Claude Code](https://claude.ai/code)

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

next.config.js

@@ -1,7 +1,10 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
   reactStrictMode: true,
-  // Remove output: 'standalone' for Amplify
+  // Ensure server-side features are enabled
+  experimental: {
+    serverActions: true,
+  },
 }
 
 module.exports = nextConfig