Add Docker configuration for port 3500

- Add Dockerfile with multi-stage build for production
- Add docker-compose.yml for easy deployment
- Add .dockerignore to exclude unnecessary files
- Add DOCKER_SETUP.md with comprehensive setup guide
- Update next.config.js to enable standalone output mode
- Configure app to run on port 3500
- Keep MySQL server external to Docker

next.config.js

@@ -1,5 +1,6 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
+  output: 'standalone',
   experimental: {
     optimizePackageImports: ['lucide-react'],
   },