- Introduced a new package `lidarr-cleanup-singles` to identify and manage duplicate single tracks in Lidarr.
- Updated `flake.nix` to include the new package in outputs and modified app definitions to support it.
- Created a new script in `src-cleanup` for the main functionality, including audio fingerprint verification.
- Added necessary dependencies and configuration in `pyproject.toml` for the new package.
- Removed unused `flake-utils` and `systems` entries from `flake.lock` to streamline the configuration.
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