feat: add vault, external-secrets, monitoring, harbor, jenkins, sonarqube, headlamp

Two-source ArgoCD Applications (upstream chart + values from this repo),
same pattern as cluster-bootstrap. Each service paired with a *-config
Application for HTTPRoute/RBAC/ClusterSecretStore that must exist
after the main install (separate sync wave).

Chart targetRevision pins and HTTPRoute backendRef service names are
best-effort - marked TODO/verify in-file since no live helm repo access
this session to confirm current versions or actual rendered svc names.

manifests/vault/values.yaml

@@ -0,0 +1,15 @@
+server:
+  dataStorage:
+    enabled: true
+    storageClass: nfs-delete
+    size: 10Gi
+  standalone:
+    enabled: true
+  ha:
+    enabled: false
+
+ui:
+  enabled: true
+
+injector:
+  enabled: true