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feat: single-replica ovn-central + PVC + LoadBalancer + Kamaji split-cluster deployment (#6793)

* feat(ovn-central): support single-replica mode backed by a PVC

Introduce OVN_CENTRAL_MODE=single in the Helm chart and rework the
chart templates, startup scripts and leader-checker so ovn-central can
run as a single-replica Deployment with the OVN DB on a PVC. The pod
can drift to another node on host failure as long as the StorageClass
supports cross-node attach.

- chart: new OVN_CENTRAL_MODE value and ovn-central.storage block;
  ovnCentralReplicas / ovnCentralNodeIPs helpers; new central-pvc.yaml
  manifest; central-deploy.yaml branches replicas, strategy,
  podAntiAffinity and the host-config-ovn volume; the three ovn-nb /
  ovn-sb / ovn-northd Services drop the leader-label selector in
  single mode so the lone pod is always the endpoint;
  controller-deploy.yaml and ovsovn-ds.yaml route OVN_DB_IPS through
  the new helper so clients fall back to the Service ClusterIPs.
- start-db.sh: the existing NODE_IPS="" standalone path now also gets
  --ovn-northd-n-threads honoured and cleans stale sockets/pids so a
  drifted pod can start cleanly on a new node.
- ovn-is-leader.sh / ovn-healthcheck.sh: short-circuit raft-only logic
  in single mode (no cluster/status query, no ovn_northd lock steal);
  keep DB storage-status check + compaction.
- pkg/ovn_leader_checker: filter empty entries out of remoteAddresses
  and add a single-replica branch that just keeps the pod labelled as
  leader for nb/sb/northd and runs compaction.

Default OVN_CENTRAL_MODE remains cluster; `helm template` of the
cluster mode renders identically to before.

Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>

* feat(install): add ENABLE_SINGLE_REPLICA_OVN to install.sh and restore script

Wire the single-replica deployment mode into install.sh so users who
do not use Helm can opt in via ENABLE_SINGLE_REPLICA_OVN=true with
optional OVN_CENTRAL_STORAGE_CLASS / OVN_CENTRAL_PVC_S... (continued)

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