REFACTOR(repo): move vault/ to manifests/

- Move ExternalSecret files from vault/ to manifests/secret.yaml
- Merge multiple secrets with --- separator (postgresql)
- Update kustomization.yaml references
- Remove vault/ folders

Apps: postgresql, postgresql-dev, pgweb, minio, velero

postgresql/kustomization.yaml

@@ -4,12 +4,7 @@ kind: Kustomization
 namespace: postgresql
 
 resources:
-  # Vault External Secrets
-  - vault/app-user-secret.yaml
-  - vault/superuser-secret.yaml
-  # - vault/backup-s3-secret.yaml  # Disabled - using Velero instead
-
-  # StorageClass with Retain policy
+  - manifests/secret.yaml
   - manifests/storageclass.yaml
 
   # CNPG Cluster