Proposal: uv workspace setup

[semohr]

Switching to a uv workspace setup addresses the growing complexity of our repo by cleanly separating the core matching/diff logic, service adapters (Plex/Spotify/Tidal/Beets), and CLI entrypoint into distinct packages.

packages/
├── core/             # Matching, diff, collection abstractions
├── services/         # Plex/Spotify/Tidal/Beets adapters  
└── cli/              # Typer CLI + config
config.py
# plistsync 

@pSpitzner Let's discuss if we want to go this route. We should definitely tie up all lose ends before we start this.

[github-actions]

Thank you for the PR! The changelog has not been updated, so here is a friendly reminder to check if you need to add an entry.

[codecov]

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