failover.sh: graceful active→standby resource migration with pre-checks
(DRBD UpToDate/UpToDate, quorum), spinner wait for XFS mount on target,
rollback on timeout, --to/--force/--dry-run/--timeout flags.
health.sh: read-only status panel — node reachability, quorum, DRBD
role/dstate/cs per node, Pacemaker resources, failure history, XFS mount
usage, and service port checks (NFS 2049, iSCSI 3260) via VIP.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
