Add GPU passthrough, fan control, and bay mapping scripts

- scripts/build-bay-map.sh: maps physical drive bays to /dev/disk/by-id paths
- scripts/gpu-passthrough-setup.sh: configures IOMMU + vfio-pci for two Quadro P2200s
- scripts/fan-control.sh: ipmitool daemon to prevent iDRAC from running fans at
  100% due to non-Dell PCIe cards; adjusts speed by inlet temperature
- scripts/fan-control.service: systemd unit for fan-control.sh

https://claude.ai/code/session_01TxTSnxDjgEVuNztdsWQjMD

scripts/build-bay-map.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+# Map physical drive bays to stable /dev/disk/by-id paths.
+# Run on the Proxmox host after perc-nonraid.sh and a reboot.
+# Output is a table you can paste into docs/hardware-layout.md.
+#
+# Requires: lsscsi, ledmon (apt install lsscsi ledmon)
+# Optional: perccli for enclosure/slot info
+
+set -euo pipefail
+
+for cmd in lsscsi; do
+  command -v "$cmd" &>/dev/null || { echo "Missing: $cmd — run: apt install $cmd"; exit 1; }
+done
+
+echo "=== Drive inventory ==="
+echo ""
+printf "%-12s %-10s %-30s %-20s %s\n" "DEVICE" "SIZE" "MODEL" "SERIAL" "BY-ID PATH"
+printf "%-12s %-10s %-30s %-20s %s\n" "------" "----" "-----" "------" "---------"
+
+for dev in /dev/sd?; do
+  [[ -b "$dev" ]] || continue
+
+  size=$(lsblk -dn -o SIZE "$dev" 2>/dev/null || echo "?")
+  model=$(cat "/sys/block/$(basename "$dev")/device/model" 2>/dev/null | tr -d ' ' || echo "?")
+  serial=$(cat "/sys/block/$(basename "$dev")/device/serial" 2>/dev/null | tr -d ' ' || echo "?")
+
+  # Prefer WWN-based by-id, fall back to scsi- or ata-
+  byid=$(ls -1 /dev/disk/by-id/ 2>/dev/null \
+    | grep -v "\-part" \
+    | while read -r link; do
+        target=$(readlink -f "/dev/disk/by-id/$link")
+        [[ "$target" == "$dev" ]] && echo "$link" && break
+      done | head -1 || echo "not found")
+
+  printf "%-12s %-10s %-30s %-20s %s\n" "$dev" "$size" "$model" "$serial" "/dev/disk/by-id/$byid"
+done
+
+echo ""
+echo "=== Bay identification via LED blink ==="
+echo ""
+echo "To confirm which physical bay a device is in, blink its LED:"
+echo "  apt install ledmon"
+echo "  ledctl locate=/dev/sdX      # LED on"
+echo "  ledctl locate_off=/dev/sdX  # LED off"
+echo ""
+
+if command -v perccli &>/dev/null || command -v perccli64 &>/dev/null; then
+  PERCCLI=$(command -v perccli || command -v perccli64)
+  echo "=== PERC slot info ==="
+  $PERCCLI /c0 /eall /sall show | grep -E "^[0-9]|Drive's position|SN|WWN" || true
+fi
+
+echo ""
+echo "Copy the BY-ID paths into docs/hardware-layout.md."