- Introduced a new `datasets.nix` file to define ZFS datasets and their properties, allowing for centralized management of dataset configurations.
- Updated `default.nix` to import and enable the `zfs_manager` service, integrating it into the system configuration.
- Refactored `zfs.sh` to remove dataset creation commands, delegating dataset management to the `zfs_manager` service.
- Removed the legacy `snapshot_config.toml` file, as snapshot configurations are now handled within `datasets.nix`.
- Modified `vars.nix` to derive mountpoint paths from `datasets.nix`, ensuring consistency across the configuration.
- Created a new `zfs.nix` file to define the `zfs_manager` service and its dependencies.
- Added comprehensive tests for the `zfs_manager` functionality, covering dataset creation, property management, and error handling.