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.

platform/apps/external-secrets-config.yaml

@@ -0,0 +1,22 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: external-secrets-config
+  namespace: argocd
+  annotations:
+    argocd.argoproj.io/sync-wave: "2"
+spec:
+  project: default
+  source:
+    repoURL: https://gitea.fireflylab.cc/duynguyen/cluster-platform.git
+    targetRevision: main
+    path: manifests/external-secrets-config
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: external-secrets
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - SkipDryRunOnMissingResource=true