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/longhorn-nodes.yaml

@@ -0,0 +1,33 @@
+# Longhorn Node CRDs for cp-2 and cp-3.
+# These nodes have the control-plane taint, so Longhorn doesn't auto-discover them.
+# Explicit Node CRDs + the taint-toleration setting enable storage across all 3 nodes.
+---
+apiVersion: longhorn.io/v1beta2
+kind: Node
+metadata:
+  name: talos-cp-2
+  namespace: longhorn-system
+spec:
+  allowScheduling: true
+  disks:
+    default-disk:
+      allowScheduling: true
+      path: /var/lib/longhorn
+      storageReserved: 0
+      tags: []
+  tags: []
+---
+apiVersion: longhorn.io/v1beta2
+kind: Node
+metadata:
+  name: talos-cp-3
+  namespace: longhorn-system
+spec:
+  allowScheduling: true
+  disks:
+    default-disk:
+      allowScheduling: true
+      path: /var/lib/longhorn
+      storageReserved: 0
+      tags: []
+  tags: []