feat(ups): NUT setup for APC Smart-UPS C 1500 on pfv-tsys1

Deploy Network UPS Tools to monitor the server-room UPS units and feed data to
Home Assistant for power-usage tracking.

APC Smart-UPS C 1500 is fully operational: battery charge, runtime, load,
voltage, and status all reporting via usbhid-ups + APC HID 0.100 subdriver.
upsd listens on Tailscale (100.121.189.98:3493) for HA polling; local upsmon
provides graceful hypervisor shutdown on battery-low.

Key deployment fix: the udev rule must cover SUBSYSTEM=="usb" (raw
/dev/bus/usb) in addition to hidraw, because usbhid-ups opens the raw USB
device file after dropping to the nut user via setuid(). Matching only hidraw
causes EACCES on driver start.

Tripp Lite UPS (09ae:3016) is blocked — driver matches TrippLite HID 0.85
subdriver but fails reading the 878-byte HID Report Descriptor (EAGAIN via USB
hub). Needs physical reseat to direct motherboard USB port. Driver masked to
prevent restart-loop spam.

Files: ups/discover.sh, ups/setup.sh (idempotent), ups/status.sh, ups/README.md

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

README.md

@@ -14,6 +14,7 @@ Unified infrastructure repo for the Known Element Enterprises Proxmox R&D cluste
 | [`k8s/`](k8s/) | k3s cluster setup scripts (3-node HA control plane over Tailscale) + co-located docs |
 | [`powerman/`](powerman/) | Cyclades PM10i PDU management via powerman on pfv-tsys1 |
 | [`console/`](console/) | Serial console management (ser2net + conman) for network switches on pfv-tsys4 |
+| [`ups/`](ups/) | UPS management (NUT) for APC Smart-UPS C 1500 on pfv-tsys1 — upsd on Tailscale |
 | [`perf/`](perf/) | Proxmox performance tuning, fleet audit, iperf, switch diagnostics |
 | [`proxmox/`](proxmox/) | Proxmox fleet docs: hardware audit, capacity analysis, k8s host planning |
 | [`netinfra/`](netinfra/) | pfv-netinfra-01/02 DNS/NTP/DHCP setup + audit scripts |