Add a staff-only schedules page with filters for host, enabled state, and
prune state, including next run and last scheduler state.
Wire the dashboard Schedules metric to the new overview so all primary
dashboard count cards have useful destinations.
Refs #23
Turn the dashboard operational status rows into direct links to filtered run
lists, so failed, warning, running, and queued states can be investigated from
the first screen.
Also move the hosts anchor back to the actual Hosts section.
Refs #23
Add staff-only list pages for backup runs and snapshots with practical
filters, then wire the dashboard summary cards and latest-runs panel to
those overviews.
This gives the dashboard real drill-down paths for run and snapshot counts
instead of leaving the data only partially visible on the first screen.
Refs #23
