feat: Add Hyperliquid exchange support with unified trader interface

Major changes:
- Add full Hyperliquid trading support (long/short, leverage, SL/TP)
- Create unified Trader interface for multi-exchange support
- Implement automatic precision handling for orders and prices
- Fix balance calculation and unrealized P&L display
- Add comprehensive configuration guide in README

New features:
- Support for both Binance and Hyperliquid exchanges
- Automatic order size precision based on szDecimals
- Price formatting with 5 significant figures
- Non-custodial trading with Ethereum private key
- Seamless exchange switching via configuration

Technical details:
- Add trader/interface.go for unified trader interface
- Add trader/hyperliquid_trader.go for Hyperliquid implementation
- Update manager and auto_trader to support multiple exchanges
- Add go-hyperliquid SDK dependency
- Fix precision errors (float_to_wire, invalid price)

Fixes:
- Correct calculation of wallet balance and unrealized P&L
- Proper handling of AccountValue vs TotalRawUsd
- Frontend display issues for total equity and P&L

Documentation:
- Add Hyperliquid setup guide in README
- Update config.json.example with both exchanges
- Add troubleshooting section for common errors

Tested with live trading on Hyperliquid mainnet.
No breaking changes - backward compatible with existing configs.

manager/trader_manager.go

@@ -33,20 +33,23 @@ func (tm *TraderManager) AddTrader(cfg config.TraderConfig, coinPoolURL string,
 
 	// 构建AutoTraderConfig
 	traderConfig := trader.AutoTraderConfig{
-		ID:               cfg.ID,
-		Name:             cfg.Name,
-		AIModel:          cfg.AIModel,
-		BinanceAPIKey:    cfg.BinanceAPIKey,
-		BinanceSecretKey: cfg.BinanceSecretKey,
-		CoinPoolAPIURL:   coinPoolURL,
-		UseQwen:          cfg.AIModel == "qwen",
-		DeepSeekKey:      cfg.DeepSeekKey,
-		QwenKey:          cfg.QwenKey,
-		ScanInterval:     cfg.GetScanInterval(),
-		InitialBalance:   cfg.InitialBalance,
-		MaxDailyLoss:     maxDailyLoss,
-		MaxDrawdown:      maxDrawdown,
-		StopTradingTime:  time.Duration(stopTradingMinutes) * time.Minute,
+		ID:                    cfg.ID,
+		Name:                  cfg.Name,
+		AIModel:               cfg.AIModel,
+		Exchange:              cfg.Exchange,
+		BinanceAPIKey:         cfg.BinanceAPIKey,
+		BinanceSecretKey:      cfg.BinanceSecretKey,
+		HyperliquidPrivateKey: cfg.HyperliquidPrivateKey,
+		HyperliquidTestnet:    cfg.HyperliquidTestnet,
+		CoinPoolAPIURL:        coinPoolURL,
+		UseQwen:               cfg.AIModel == "qwen",
+		DeepSeekKey:           cfg.DeepSeekKey,
+		QwenKey:               cfg.QwenKey,
+		ScanInterval:          cfg.GetScanInterval(),
+		InitialBalance:        cfg.InitialBalance,
+		MaxDailyLoss:          maxDailyLoss,
+		MaxDrawdown:           maxDrawdown,
+		StopTradingTime:       time.Duration(stopTradingMinutes) * time.Minute,
 	}
 
 	// 创建trader实例