Initial backup: 18 monitoring scripts + timers + docs

- 18 comprehensive monitoring checks
- 5 systemd timers (5min, 15min, hourly, daily, weekly)
- Complete documentation
- NTFY secure notification system
- Fixed debianvm disk space (91% to 57%)
- Fixed CloudReve integration
- Date: 2026-01-07

timers/homelab-monitor-5min.timer

@@ -0,0 +1,10 @@
+[Unit]
+Description=Homelab monitoring every 5 minutes
+
+[Timer]
+OnBootSec=2min
+OnUnitActiveSec=5min
+Persistent=true
+
+[Install]
+WantedBy=timers.target