[Bug] Not safe for no embedding case in Knowledgebase

[Phinease]

Nexent Version

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Problem Description

对于Embedding模型未配置时，会判断知识库不可用，则显示一个灰色的遮罩和embedding.knowledgeBaseDisabledWarningModal.title，这样是不安全的，应该不显示后边的内容，直接使用一个同样大小的container显示embedding.knowledgeBaseDisabledWarningModal.title即可

Reproduction Steps

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Additional Information

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