REFACTOR(repo): remove control-plane scheduling

- Remove nodeSelector for control-plane node
- Remove tolerations for control-plane taint
- Allow pods to schedule on any available node

vault/helm-values.yaml

@@ -72,12 +72,6 @@ server:
     type: ClusterIP
     port: 8200
 
-  # Tolerations for control-plane node (keep for 3-replica HA)
-  tolerations:
-    - key: "node-role.kubernetes.io/control-plane"
-      operator: "Exists"
-      effect: "NoSchedule"
-
   # High priority for critical secrets management
   priorityClassName: high-priority