Remove MTU migration rollback - moving to homelab-scripts repo

scripts/network/mtu_rollback.sh

@@ -1,20 +0,0 @@
-#!/bin/bash
-# ROLLBACK — restore daemon.json to original (no mtu field)
-HOST=$(hostname)
-LOG=/volume1/docker/mtu_migration/${HOST}_rollback.log
-exec >> "$LOG" 2>&1
-echo "[$(date)] $HOST ROLLBACK starting"
-cat > /etc/docker/daemon.json << 'DAEMON'
-{
-  "data-root": "/volume1/docker-root/",
-  "storage-driver": "overlay2",
-  "dns-search": ["."]
-}
-DAEMON
-echo "[$(date)] daemon.json restored: $(cat /etc/docker/daemon.json)"
-systemctl restart docker
-sleep 15
-echo "[$(date)] Docker status: $(systemctl is-active docker)"
-echo "[$(date)] eth0 MTU: $(ip link show eth0 | grep -o 'mtu [0-9]*')"
-touch /volume1/docker/mtu_migration/${HOST}_rollback.done
-echo "[$(date)] $HOST ROLLBACK COMPLETE"