new feat: instantiate a new VM without NIC

##### ISSUE TYPE

* Feature Idea

##### COMPONENT NAME

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UI
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##### SUMMARY

I need to instantiate a new instance from an existing template without a network card, or at least with it disabled since it contains services that connects automatically to the net at startup. AFAIK the "New instance" functionality does not allow to launch an instance without a network interface.

从 UI 的“New instance”流程开始，跟踪它如何根据现有 template 创建实例并配置网络接口。将完成定义为允许新实例在没有网卡或网络接口被禁用的情况下启动，并通过相关的 UI 或实例创建测试验证该行为。

由索引模型根据 Issue 内容生成。