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/external-secrets-config/clustersecretstore.yaml

@@ -0,0 +1,17 @@
+apiVersion: external-secrets.io/v1beta1
+kind: ClusterSecretStore
+metadata:
+  name: vault-backend
+spec:
+  provider:
+    vault:
+      server: "http://vault.vault.svc.cluster.local:8200"
+      path: kv
+      version: v2
+      auth:
+        kubernetes:
+          mountPath: kubernetes
+          role: external-secrets
+          serviceAccountRef:
+            name: external-secrets-vault-auth
+            namespace: external-secrets