Add image input support for multimodal model like gpt4o

[joeyzenghuan]

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像gpt-4o这样的多模态模型，支持图片作为prompt的一部分，请问近期是否有计划增加这个功能，谢谢。
support image input

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可以直接复制粘贴截图进入对话输入框，或者提供一个上传图片的按钮。

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