[Feature]: Enhance the capabilities of the [File] module.

Summary
Enhance the capabilities of the [File] module.

Problem / Motivation
The current [File] module can only view markdown (.md) files located in the working space directory. This limitation makes the feature feel unfinished and significantly restricts its practical utility.

Proposed Solution
Transform the [File] module into a comprehensive file browser, similar to FileBrowser. This would allow users to manage files on the host machine directly through the web interface (including uploading, downloading, and browsing).

By implementing this, the barrier to file exchange is removed for users who are not familiar with Linux systems. The entire machine could then operate in a completely "headless" mode.