feat: maintenance windows, reports, uptime widget, alert improvements
- Add maintenance window scheduling to suppress alerts during planned
downtime (model, routes, templates)
- Add weekly email/webhook reports with host summary (core/reports.py,
Settings → Reports tab)
- Add host uptime history widget with per-check sparkline view
- Expand alert rules: dynamic metric catalog for plugin sources,
per-rule HTMX field loading, maintenance window awareness
- Register additional dashboard widgets (uptime, SNMP, UniFi, UPS)
- Add Settings → Reports tab configuration
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
bvandeusen
ced1eebe1d