Retire SR-IOV, NIC tuning and watchdog scripts to unused/

Checked against the live host. None of these are in service:

- sriov-enp4s0.service and set-ixgbe-vfmacs-enp4s0.sh target enp4s0f1np1,
  which no longer exists; sriov_numvfs is 0 on every port and the unit was
  never installed.
- nic-performance-tweaks.service was never installed either, though its
  interfaces do still exist, so it would work if reinstated.
- vm-watchdog.sh watches VMID 2801 "pfsense", which no longer exists.
- lxc-watchdog.sh still carries the upstream example targets: CT 100 and
  CT 101 on 192.168.31.0/24, a subnet that is not in use.

Neither watchdog is scheduled; there is no root crontab.

The watchdog config moves to unused/conf/ alongside them, so the scripts
resolve it unchanged from their new location.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

unused/vm-watchdog.sh

@@ -0,0 +1,73 @@
+#!/bin/bash
+#
+# WatchDog script for Proxmox VMs
+# v2.0
+#
+# Install using `crontab -e` like this: * * * * * /root/watchdog.sh
+#
+# Configurable Settings
+declare -A VMs=(
+    ["pfsense"]="2801 10.20.28.1"
+)
+
+logFile="/var/log/proxmox_watchdog.log"
+
+# Alert address comes from conf/watchdog.conf (see conf/watchdog.conf.example),
+# resolved relative to this script so it works from a checkout or /opt/ergosteur.
+SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)
+CONFIG=${WATCHDOG_CONFIG:-$SCRIPT_DIR/conf/watchdog.conf}
+email=""
+if [[ -r "$CONFIG" ]]; then
+    # shellcheck source=/dev/null
+    . "$CONFIG"
+    email="${WATCHDOG_EMAIL:-}"
+fi
+
+# Log function
+log () {
+    output="[WatchDog] $(date '+%Y-%m-%d %H:%M:%S') $1"
+    echo "$output" >> "$logFile"
+    logger "$output"
+}
+
+# Send email alert
+sendAlert () {
+    subject="[Proxmox WatchDog] $1"
+    body="$2"
+    if [[ -z "$email" ]]; then
+        log "No WATCHDOG_EMAIL configured in $CONFIG; skipping alert: $subject"
+        return
+    fi
+    echo -e "$body" | mail -s "$subject" "$email"
+}
+
+# Check VM function
+checkVM () {
+    local vmName=$1
+    local vmId=$2
+    local vmIp=$3
+
+    if /usr/bin/ping -c 1 "$vmIp" &> /dev/null; then
+        local vmUptime
+        vmUptime=$(/usr/sbin/qm status "$vmId" -verbose | grep uptime | cut -f2 -d' ')
+        log "$vmName ($vmIp) is alive. Uptime: $vmUptime seconds."
+    else
+        log "$vmName ($vmIp) is down. Attempting restart..."
+        if /usr/sbin/qm stop "$vmId" && /usr/sbin/qm start "$vmId"; then
+            log "$vmName restarted successfully."
+            sendAlert "$vmName Restarted" "The VM '$vmName' was restarted by the watchdog script."
+        else
+            log "Failed to restart $vmName. Manual intervention required."
+            sendAlert "$vmName Restart Failed" "The VM '$vmName' failed to restart. Please check Proxmox immediately."
+        fi
+    fi
+}
+
+# Main Logic
+for vmName in "${!VMs[@]}"; do
+    read -r vmId vmIp <<< "${VMs[$vmName]}"
+    checkVM "$vmName" "$vmId" "$vmIp" &
+done
+
+# Wait for all background checks to complete
+wait