xby-fetch: DSH Web Content Scraping Plugin

`xby-fetch` is an MCP server plugin for DeepSeek Harness (DSH) agents, addressing the lack of internet connectivity in earlier versions. It supports converting web page HTML to Markdown for easier content processing. After installation, an API key must be set via a command to gain access. The plugin retrieves content from a specified URL using the `fetch` command, enabling the agent to obtain the latest information. Note that users must register on the Xiaobenyang official website to obtain the API key, and it is recommended to review the source code and license before installation.