SeaweedFS: Path traversal in the S3 and Iceberg REST gateways allows cross-bucket access

Summary The S3 API gateway and the Iceberg REST catalog gateway construct their routers with mux.NewRouter.SkipCleantrue. With path cleaning disabled, a .. segment inside the URL survives routing, so a request such as: GET /bucket-A/../evil-bucket/key is matched as bucket=bucket-A,...