支持上传附件

[muhanstudio]

memos 正式版已经支持了附件上传，而 moememos 貌似目前还是只能上传图片，希望可以适配一下

[Issues-translate-bot]

Issue is not in English. It has been translated automatically.

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Title: to support uploading attachments

The official version of memos already supports uploading attachments, but it seems that moememos can still only upload images. I hope it can be adapted