refactor: update Vault secret paths to new categorized structure

- minio: minio → storage/minio, minio-s3-credentials → storage/minio-s3-credentials
- pgweb: pgweb → storage/pgweb
- postgresql: postgresql → storage/postgresql
- velero: minio → storage/minio, velero → storage/velero
- zot: zot → storage/zot

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

velero/manifests/secret.yaml

@@ -21,11 +21,11 @@ spec:
   data:
     - secretKey: minioAccessKey
       remoteRef:
-        key: minio
+        key: storage/minio
         property: ROOT_USER
     - secretKey: minioSecretKey
       remoteRef:
-        key: minio
+        key: storage/minio
         property: ROOT_PASSWORD
 
 ---
@@ -45,9 +45,9 @@ spec:
   data:
     - secretKey: username
       remoteRef:
-        key: velero
+        key: storage/velero
         property: UI_USERNAME
     - secretKey: password
       remoteRef:
-        key: velero
+        key: storage/velero
         property: UI_PASSWORD