- Add hyperliquid_trading_service.py with position management and TP/SL
- Implement dual-track trading (paper trading + Hyperliquid)
- Add position size calculation based on available margin
- Support net position mode (Hyperliquid) vs order mode (paper)
- Add risk controls: 10% circuit breaker, 10x max leverage
- Add test script for Hyperliquid SDK validation
