add dependences to pyproject.toml

[Inkogni7o]

When installing manually, uv cannot install all dependencies because they are not specified in the file pyproject.toml

[BigBodyCobain]

Thanks for the PR. I see what you were trying to fix, but I do not want to merge this as-is.

The root pyproject.toml is workspace-level metadata. The actual backend runtime dependencies are maintained in backend/pyproject.toml, where they are pinned intentionally for reproducible Docker/local installs.

This PR adds a partial dependency list to the root project, omits several required backend packages, uses a couple of different package names than the backend currently uses, and loosens pinned versions into broad >= ranges. That could make installs less reproducible and harder to debug.

I should add a comment/docs clarification so contributors know backend dependencies live in backend/pyproject.toml, but I’m going to close this PR rather than merge the dependency duplication.