The file restore command previously assumed that the target volume name
was identical to the volume name used in the backup path. This caused
restores to fail (exit code 2) when restoring data from one volume backup
into a different target volume.
Introduce an optional --source-volume argument for `baudolo-restore files`
to explicitly specify the backup source volume while keeping the target
volume unchanged.
- Default behavior remains fully backward-compatible
- Enables restoring backups from volume A into volume B
- Fixes E2E test scenario restoring into a new volume
Tests:
- Update E2E file restore test to use --source-volume
https://chatgpt.com/share/694ec70f-1d7c-800f-b221-9d22e4b0775e
