Make the system config a tracked backup, not just action buttons:
- engine: resticSystemSnapshotsJson (tag system=config) + engineSystemSnapshotsJson
dispatcher — query the system snapshots the way per-app status is queried.
- webui_backup_dashboard.sh: emit a "system": { latest_snapshot, latest_time }
object (latest system snapshot on the primary location), and exclude the
libreportal WebUI app from the per-app grid (it's intentionally not backed up, so
it no longer shows a perpetual "No backup yet" tile).
- backup dashboard card: a status line (dot + "Last backed up <relative>" / "No
backup yet"), populated in renderDashboard from d.system — mirrors the app tiles.
Verified: shell + JS parse; dashboard content assembles to valid JSON with the
system key; engine query defined + dispatched; frontend reads d.system into the
#backup-system-status element.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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