project: pyproject.toml, uv, ruff...

I would make a PR but I think it would better if the maintainer checked it out himself. 

1. Migrate to pyproject.toml + uv (https://docs.astral.sh/uv/)
2. run ruff formatting on the codebase (https://docs.astral.sh/ruff/)

These tools are becoming standard in the ecosystem and it would be a good step for the repo