dsh-lan-share: A LAN File Sharing Plugin for DeepSeek Harness

`dsh-lan-share` is a local file-sharing plugin for DeepSeek Harness (DSH). It uses native Node.js modules to provide file browsing, download, and upload services over HTTP within a local area network. The plugin has zero dependencies, supports token or fixed-password authentication, and includes security features such as read-only mode, path boundary protection, rate limiting, and automatic hiding of sensitive files (e.g., `.env` files and keys). Users can enable it via a configuration file and control the service using commands such as `lan_share_start`, `lan_share_status`, and `lan_share_stop`.