REFACTOR(postgresql): restructure pgweb

- and pg-dev folder str...
- Remove argocd/, helm-values/ subdirectories
- Move files to parent directory with standardized names
- Add namespace.yaml to both apps with Goldilocks labels
- Preserve vault/ subdirectories (pgweb: 3 files, postgresql-dev: 1
  file)
- Update main kustomization.yaml to reference argocd.yaml files directly
- Update postgresql-dev helm valueFiles path
- Comment out argocd.yaml in each app's kustomization.yaml to prevent
  circular reference

Applications restructured:
- pgweb
- postgresql-dev

postgresql-dev/kustomization.yaml

@@ -2,6 +2,7 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
 resources:
-  # ArgoCD Application 리소스는 infrastructure/kustomization.yaml에서 관리
-  # - argocd/postgresql-dev.yaml
+  # argocd.yaml은 수동으로 관리 (순환 참조 방지)
+  # - argocd.yaml
+  - namespace.yaml
   - vault/postgresql-password-dev.yaml