xby-read-pdf: DeepSeek Harness (DSH) PDF Reader Plugin

The `xby-read-pdf` plugin for DeepSeek Harness (DSH) is built on the "everything is a plugin" philosophy and aims to provide AI agents with standardized local PDF processing capabilities. As an MCP server, it supports full-text extraction, reading of specified pages, metadata retrieval, and keyword search, addressing the issue that models cannot directly understand PDFs. To install it, use the `--profile web` parameter and set the API key via `set_xby_apikey`. It provides a convenient tool for building agents with document analysis capabilities; the installation command is `dsh plugin --profile web add github:xby_skill/xby-read-pdf`.