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

.dockerignore

@@ -0,0 +1,18 @@
+Dockerfile
+.dockerignore
+.git
+.gitignore
+.next
+.kiro
+.vscode
+node_modules
+npm-debug.log
+README.md
+*.md
+.env
+.env.local
+.env.*.local
+coverage
+.DS_Store
+*.pem
+tsconfig.tsbuildinfo