feat: export all K8 Plus cluster manifests

Namespaces: argocd, authentik, backup-system, cloudflare-ddns,
gitea, homarr, monitoring, n8n, openclaw, polymarket-bot, vaultwarden
Cluster-wide: clusterissuers, namespaces
Secrets: redacted (structure only, data=REDACTED)

monitoring/secret-kube-prometheus-stack-grafana.yaml

@@ -0,0 +1,21 @@
+apiVersion: v1
+data:
+  admin-password: REDACTED
+  admin-user: REDACTED
+  ldap-toml: REDACTED
+kind: Secret
+metadata:
+  annotations:
+    meta.helm.sh/release-name: kube-prometheus-stack
+    meta.helm.sh/release-namespace: monitoring
+  labels:
+    app.kubernetes.io/component: admin-secret
+    app.kubernetes.io/instance: kube-prometheus-stack
+    app.kubernetes.io/managed-by: Helm
+    app.kubernetes.io/name: grafana
+    app.kubernetes.io/version: 12.4.2
+    helm.sh/chart: grafana-11.5.0
+  name: kube-prometheus-stack-grafana
+  namespace: monitoring
+type: Opaque
+