- Added DataConnector base class with OHLCV, InstrumentInfo, Interval
- Implemented MoomooClient with rate limiting, circuit breaker, caching
- Mock mode generates realistic data for development
- Real-time WebSocket subscription support (mock)
- Added examples/demo_moomoo.py showcasing functionality
- Updated requirements.txt with requests, websocket-client, redis, python-dotenv
- Updated README.md with Data Layer documentation
- Added .env.example for configuration
- Basic Flask backend with mock metrics API
- Bootstrap/Chart.js frontend dashboard
- Displays key metrics: PnL, drawdown, win rate
- Interactive charts and auto-refresh
- Ready for integration with real data sources
