[Feature Request]: web UI 支持上传文档后解析阅览

[ListenQ]

Do you need to file a feature request?

• I have searched the existing feature request and this feature request is not already filed.
• I believe this is a legitimate feature request, not just a question or bug.

Feature Request Description

1. 需要支持 LightRAG Web UI 上传文档后解析 结果阅览，如果解析的不对还可以支持 编辑，在点击确认处理后才进行 切分文档处理
2. 支持 LightRAG Web UI 上可以下载源上传的文件

Additional Context

No response