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)

mcp/client.go

@@ -280,8 +280,8 @@ func isRetryableError(err error) bool {
 		"connection refused",
 		"temporary failure",
 		"no such host",
-		"stream error",      // HTTP/2 stream 错误
-		"INTERNAL_ERROR",    // 服务端内部错误
+		"stream error",   // HTTP/2 stream 错误
+		"INTERNAL_ERROR", // 服务端内部错误
 	}
 	for _, retryable := range retryableErrors {
 		if strings.Contains(errStr, retryable) {