docs(AIT-65694): document DCS multi-NIC pool configuration

[van0828]

Summary

本 PR 补充 Huawei DCS 多网卡能力在产品文档中的说明，范围限定为产品化 Pool 配置，不包含 S1 手工迁移方案。

主要内容：

• 在 DCS 创建集群、基础设施、节点管理和升级文档中补充 DCSIpHostnamePool.spec.pool[].additionNic[] 的使用说明。
• 说明 additionNic[] 只在 provider 创建新 VM 时生效，编辑 Pool 不会热更新已有 VM。
• 说明运行时可通过 DCSMachine.status.additionalNic 查看 provider 记录的附加网卡信息。
• 在升级文档中说明附加网卡配置应保留在 DCSIpHostnamePool，不要迁移到 DCSMachineTemplate。
• 同步 Huawei DCS shared CRD：补充 persistentDisk[].isThin、DCSMachine.status.cdRomDetached、DCSMachine.status.cdRomFileDeleted。

Validation

• git diff --check
• Review 了 6 个变更文件的产品文档范围、字段说明、锚点引用和 shared CRD 与 provider origin/release-1.0 的一致性。
• 确认没有新增 S1 多网卡迁移 how-to 文档。

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