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)

argocd/secret-argocd-secret.yaml

@@ -0,0 +1,20 @@
+apiVersion: v1
+data:
+  admin.password: REDACTED
+  admin.passwordMtime: REDACTED
+  server.secretkey: REDACTED
+  tls.crt: REDACTED
+  tls.key: REDACTED
+kind: Secret
+metadata:
+  annotations:
+    kubectl.kubernetes.io/last-applied-configuration: '{"apiVersion":"v1","kind":"Secret","metadata":{"annotations":{},"labels":{"app.kubernetes.io/name":"argocd-secret","app.kubernetes.io/part-of":"argocd"},"name":"argocd-secret","namespace":"argocd"},"type":"Opaque"}
+
+      '
+  labels:
+    app.kubernetes.io/name: argocd-secret
+    app.kubernetes.io/part-of: argocd
+  name: argocd-secret
+  namespace: argocd
+type: Opaque
+