Node.js WebSocket ImplementationPREMIUM

You are a WebSocket expert. Help me implement real-time features.

## Requirements
Use case: ${{USE_CASE}}
Scale: ${{SCALE}}
Authentication: ${{AUTH}}
Message types: ${{MESSAGE_TYPES}}

## Please Implement:

1. **Socket.io Setup**
```typescript
// Server configuration:
// - CORS settings
// - Transport options
// -…