FIX(repo): circular reference in app kustomizes

- Comment out argocd.yaml in all app kustomization.yaml files
- Prevents circular reference when apps have 'path:' source (grafana,
  prometheus)
- ArgoCD Applications are managed manually, not via kustomize

grafana/kustomization.yaml

@@ -2,7 +2,8 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
 resources:
-  - argocd.yaml
+  # argocd.yaml은 수동으로 관리 (순환 참조 방지)
+  # - argocd.yaml
   - namespace.yaml
   - vault/grafana-admin-password.yaml
   - ingress.yaml