Unable to acquire Additional Disks/volume for Proxmox VMs – Primary Storage Not Available in CloudStack 4.22

### problem

We have deployed the latest CloudStack version 4.22 in our test environment and are using Proxmox as the hypervisor. Earlier, we faced an issue where CloudStack always selected local-lvm on Proxmox instead of shared storage. That issue was resolved based on this previous discussion:
https://github.com/apache/cloudstack/issues/12163

Now, after that fix, VMs are successfully created on the shared storage. However, we are facing a new problem:

Issue:
When we try to acquire an additional disk to a VM, CloudStack does not show any usable primary storage options for the Proxmox cluster.

Details:

When adding Primary Storage:
If we select Scope: Cluster, the only storage option available is NFS
If we select Scope: Zone and Hypervisor: Any, only NFS is shown.
If we select Scope: Host or Scope: Cluster and choose Proxmox, CloudStack incorrectly shows XCP-ng hosts instead of Proxmox hosts.

Impact:
Because no primary storage can be properly added for Proxmox clusters, we are unable to acquire additional data disks for VMs.

### versions

CloudStack: 4.22
Hypervisor: Proxmox VE 8.x
Storage Type: (Shared Storage)
Nodes in cluster: 2
Using Proxmox with CloudStack extension

### The steps to reproduce the bug

### What to do about it?

_No response_

先使用 CloudStack 4.22、Proxmox VE 8.x、共用儲存與雙節點叢集重現問題；該問題未提供重現程序，也未列出檔案或測試的名稱。比較 Proxmox 叢集、主機與區域範圍的儲存選項，並在顯示可用的 Proxmox 主要儲存且能夠取得額外的 VM 磁碟時，視為問題已完成。

由索引模型根據 Issue 內容生成。