feat(storage): enable Longhorn on all 3 control-plane nodes for true HA

Changes:
- k8s/infrastructure/longhorn/longhorn-taint-toleration.yaml: new Setting
  to tolerate node-role.kubernetes.io/control-plane:NoSchedule taint,
  allowing Longhorn DaemonSet to run on cp-2/cp-3 (not just cp-1)
- k8s/infrastructure/longhorn/longhorn-nodes.yaml: explicit Node CRDs for
  talos-cp-2 and talos-cp-3 (auto-discovery doesn't work when nodes have
  taints; these define /var/lib/longhorn as the storage path)
- k8s/infrastructure/longhorn/longhorn-wffc-storageclass.yaml: bump
  numberOfReplicas from 1→3 (true HA: each volume gets 3 copies across
  3 nodes; if one node fails, 2 others still have the data)
- k8s/infrastructure/longhorn/kustomization.yaml: add new resources

Root cause: Longhorn was only running on talos-cp-1 (.213) because cp-2/cp-3
have the control-plane taint and Longhorn DaemonSet had no matching toleration.
Every workload with a PVC was forced to schedule on cp-1 (via nodeSelector or
implicit co-location with the storage), defeating the entire purpose of a 3-node
HA cluster.

With this fix:
- Longhorn manager runs on all 3 nodes
- Storage is replicated 3x (erasure-coded across nodes)
- Pods can schedule on any node without PVC attachment failures
- True HA: lose 1 node, cluster still serves all volumes

k8s/infrastructure/longhorn/kustomization.yaml

@@ -3,6 +3,10 @@ kind: Kustomization
 namespace: longhorn-system
 resources:
   - longhorn-wffc-storageclass.yaml
-# Longhorn deployed via Helm chart (values in parent layer). The WFFC
-# StorageClass above is the new default; the chart's Immediate `longhorn` SC is
-# demoted (default-class annotation removed on the live object at bootstrap).
+  - longhorn-servicemonitor.yaml
+  - longhorn-taint-toleration.yaml
+  - longhorn-nodes.yaml
+# Longhorn deployed via bootstrap script (cluster-config/longhorn_bootstrap.sh).
+# These manifests configure it post-bootstrap: WFFC StorageClass (default),
+# Prometheus ServiceMonitor, taint toleration for control-plane nodes, and
+# explicit Node CRDs for cp-2/cp-3 (auto-discovery doesn't work with taints).