Extend the restore guidance with directory and single-file dry-run
examples so operators can restore a focused path without copying an
entire snapshot.
Render the examples on snapshot detail pages using the selected
snapshot's data path and the host-specific staging destination.
Document the manual restore workflow in the README and surface snapshot-
specific restore commands on the snapshot detail page.
The guidance keeps restores intentionally manual for now: inspect the
snapshot data directory, run rsync with --dry-run, restore to staging
first, and treat hardlinked snapshot files as read-only.
