nspawn-vault-web v0.1.0-24

nspawn-vault-web v0.1.0-24

Adds a manual "Run prune now" button to the Admin GFS Retention
section - starts nspawn-vault-prune.service immediately instead of
waiting for its daily 04:00 timer.

Why

Same reasoning as the existing per-host "Run now" pull trigger: useful
right after changing GFS retention settings and wanting to see the effect
immediately, or to reclaim storage proactively instead of waiting
overnight. The operation itself isn't new or risky - it's the exact same
GFS policy that already runs automatically every night, just triggered on
demand.

Verified live

Triggered a real prune run against the production vault: a container's
snapshot count dropped from 41 to 27 immediately, matching exactly what
the retention figures added in v0.1.0-23 predicted it would.