Bug: listHostsMetrics response mapping mismatch (hostmetrics --> host) causes null parsing.

The CloudStack backend response for listHostsMetrics has changed its JSON structure, but the cloudstack-go wrapper is still parsing the old field (hostmetrics).
This results in host metrics being returned as null in the Go SDK response.

Affected Component

API: listHostsMetrics (command)

Client: github.com/apache/cloudstack-go/v2

Version tested: v2.19.0 (and likely later)

Key change:
The backend now returns metrics under the field host, not hostmetrics.
Go SDK should correctly deserialize host metrics into a non-nil slice.

Actual SDK Behavior currently
{
"count": 3,
"host": null
}

Please rectify.

先檢查用於 listHostsMetrics API 的 cloudstack-go v2 wrapper 及其回應對映。根據 issue 中描述的後端欄位確認該對映，接著驗證 SDK 回傳的 host metrics slice 是否為非 nil；關聯的 pull request #137 表示相關工作已經在進行中。

由索引模型根據 Issue 內容生成。