Add Docker support: Dockerfile, docker-compose.yml, and production configuration

- Add Dockerfile with multi-stage build for Flask app containerization
- Include .dockerignore to optimize build context
- Add docker-compose.yml for easy deployment with health checks
- Update run.py to handle production mode with allow_unsafe_werkzeug
- Add DOCKER.md with comprehensive deployment instructions
- Configure health check endpoint at /health
- Run as non-root user for security
- Support for environment variables and proper port mapping

run.py

@@ -11,4 +11,10 @@ config_name = os.getenv('FLASK_CONFIG', 'development')
 app = create_app(config_name)
 
 if __name__ == '__main__':
-    socketio.run(app, debug=True, host='0.0.0.0', port=5000)
+    debug_mode = os.getenv('FLASK_ENV', 'development') == 'development'
+    
+    # For production deployment, allow unsafe werkzeug or use a proper WSGI server
+    if os.getenv('FLASK_ENV') == 'production':
+        socketio.run(app, debug=False, host='0.0.0.0', port=5000, allow_unsafe_werkzeug=True)
+    else:
+        socketio.run(app, debug=debug_mode, host='0.0.0.0', port=5000)