feat: add Bitget futures trading support

- Add BitgetTrader with full trading implementation
- Support one-way position mode with proper API parameters
- Add Bitget to all exchange switch statements
- Update exchange icons (Bybit, OKX, Bitget, Lighter)
- Add Bitget to frontend exchange config modal

trader/auto_trader.go

@@ -22,7 +22,7 @@ type AutoTraderConfig struct {
 	AIModel string // AI model: "qwen" or "deepseek"
 
 	// Trading platform selection
-	Exchange   string // Exchange type: "binance", "bybit", "okx", "hyperliquid", "aster" or "lighter"
+	Exchange   string // Exchange type: "binance", "bybit", "okx", "bitget", "hyperliquid", "aster" or "lighter"
 	ExchangeID string // Exchange account UUID (for multi-account support)
 
 	// Binance API configuration
@@ -38,6 +38,11 @@ type AutoTraderConfig struct {
 	OKXSecretKey string
 	OKXPassphrase string
 
+	// Bitget API configuration
+	BitgetAPIKey    string
+	BitgetSecretKey string
+	BitgetPassphrase string
+
 	// Hyperliquid configuration
 	HyperliquidPrivateKey string
 	HyperliquidWalletAddr string
@@ -222,6 +227,9 @@ func NewAutoTrader(config AutoTraderConfig, st *store.Store, userID string) (*Au
 	case "okx":
 		logger.Infof("🏦 [%s] Using OKX Futures trading", config.Name)
 		trader = NewOKXTrader(config.OKXAPIKey, config.OKXSecretKey, config.OKXPassphrase)
+	case "bitget":
+		logger.Infof("🏦 [%s] Using Bitget Futures trading", config.Name)
+		trader = NewBitgetTrader(config.BitgetAPIKey, config.BitgetSecretKey, config.BitgetPassphrase)
 	case "hyperliquid":
 		logger.Infof("🏦 [%s] Using Hyperliquid trading", config.Name)
 		trader, err = NewHyperliquidTrader(config.HyperliquidPrivateKey, config.HyperliquidWalletAddr, config.HyperliquidTestnet)

trader/position_sync.go

@@ -500,6 +500,9 @@ func (m *PositionSyncManager) createTrader(config *store.TraderFullConfig) (Trad
 	case "okx":
 		return NewOKXTrader(exchange.APIKey, exchange.SecretKey, exchange.Passphrase), nil
 
+	case "bitget":
+		return NewBitgetTrader(exchange.APIKey, exchange.SecretKey, exchange.Passphrase), nil
+
 	case "hyperliquid":
 		return NewHyperliquidTrader(exchange.SecretKey, exchange.HyperliquidWalletAddr, exchange.Testnet)