feat: replace local index server with uv flat index

[tiran]

Pull Request Description

What

incomplete and work-in-progress

uv supports flat indexes, which are local directories that contain a bunch of wheel files. Experiment if it is possible to replace our custom wheel server with flat indexes. We would not need to spin up a web server, symlink files, and uv could directly access the files from disk.

See: https://docs.astral.sh/uv/concepts/indexes/#flat-indexes

• PR follows CONTRIBUTING.md guidelines

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[mergify]

This pull request has merge conflicts that must be resolved before it can be merged.
@tiran please rebase your branch.