Add image input support for multimodal model like gpt4o

[joeyzenghuan]

Is your feature request related to a problem? Please describe. 新功能是否与解决某个问题相关, 请描述 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

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

Describe the solution you'd like 你期望的新功能实现方案 A clear and concise description of what you want to happen.

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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