fetchPypi with pyproject format was causing "Unsupported format pyproject"
error. Switched to fetchFromGitHub to match the pattern used by other
packages in this repo (e.g. zotero-mcp).
Note: the SRI hash is a placeholder — run `nix build .#applemusic-mcp`
and replace with the correct hash from the error output on first build.
Cross-platform Apple Music MCP server supporting playlist management,
library search, and catalog access via media-user-token (no Apple
Developer account required).
https://github.com/epheterson/applemusic-mcp