[Feature] I hope the image understanding node can support url and other input methods

[linfengjjj]

MaxKB Version

v1.10.2-LTS

Please describe your needs or suggestions for improvements

希望图片理解节点可以支持url等输入方式，用户可能在提问中输入图片url或者markdown的uri。 目前用url或markdown的uri都不能理解。

Please describe the solution you suggest

No response

Additional Information

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