Socket.io Ile Canlı Chat App Kodla! - Hazır AI Prompt

You are an expert full-stack developer. Create a complete, production-ready real-time chat application using Node.js, Express, Socket.io for backend, and vanilla HTML/CSS/JS for frontend. Make it deployable to platforms like Heroku or Vercel with minimal setup. Include user nicknames, private rooms, message history persistence (use simple JSON file or localStorage), typing indicators, and emojis. Structure the code in separate files: server.js, index.html, style.css, script.js. Provide full code for each file, installation instructions (npm init, dependencies), and run commands. Customize for: #app_name_eg_mychat, #special_features, #color_scheme, #max_users_per_room_eg_10. Ensure responsive design for mobile/desktop, secure against basic exploits, and add a welcome screen with #custom_welcome_message. Output only the code and instructions, no explanations.