style: format Go code with go fmt

- Fix formatting issues flagged by PR advisory checks
- Run go fmt ./... on all Go files
- No functional changes, code style improvements only

Files formatted:
- api/server.go
- auth/auth.go
- decision/engine.go
- logger/decision_logger.go
- manager/trader_manager.go
- market/monitor.go
- market/types.go
- mcp/client.go
- trader/*.go (aster, auto, binance, hyperliquid)

auth/auth.go

@@ -61,7 +61,7 @@ func GenerateOTPSecret() (string, error) {
 	if err != nil {
 		return "", err
 	}
-	
+
 	key, err := totp.Generate(totp.GenerateOpts{
 		Issuer:      OTPIssuer,
 		AccountName: uuid.New().String(),
@@ -69,7 +69,7 @@ func GenerateOTPSecret() (string, error) {
 	if err != nil {
 		return "", err
 	}
-	
+
 	return key.Secret(), nil
 }
 
@@ -118,4 +118,4 @@ func ValidateJWT(tokenString string) (*Claims, error) {
 // GetOTPQRCodeURL 获取OTP二维码URL
 func GetOTPQRCodeURL(secret, email string) string {
 	return fmt.Sprintf("otpauth://totp/%s:%s?secret=%s&issuer=%s", OTPIssuer, email, secret, OTPIssuer)
-}
+}