I wanted the same, so I made my own. Initially I started it without vibe coding, but as I wanted to add more features than the initial working S3 API, I decided it's not worth the time to not vibe simple API stuff. I use it for backups, for a Minio replacement in a Milvus database and other random stuff. Not bad for a week work. It's single node so far and not meant for distributed computing.

https://github.com/ferdzo/fs