- Add email notifications via PVE::Notify for all UPS events:
- ONBATT: when UPS switches to battery
- ONLINE: when power is restored
- LOWBATT: critical battery level
- SHUTDOWN_START/NODE/PRIMARY: during cluster shutdown
- COMMBAD: communication lost with UPS
- Add automatic UPS shutdown command after cluster shutdown
(protects against power surge when power returns)
- Update upssched.conf with ONLINE handler and immediate ONBATT notification
- Add notification templates for HTML and text emails
- Update documentation with new features and timer configuration
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
