dsh-netcatty: Connect the DeepSeek Harness to Netcatty's External MCP Server

`dsh-netcatty` is a plugin that connects DeepSeek Harness (DSH) to the Netcatty External MCP server. It allows DSH to securely invoke Netcatty's SSH and SFTP tools via standard protocols without exposing sensitive credentials. Core features include connecting to official servers, tool registration, permission control, and reconnection after disconnection. Installation requires DeepSeek Harness 0.1.0-rc.7 or later and Netcatty 1.1.80 or later, with support for non-standard path configuration and customized parameter adjustments. By default, it follows the principle of least privilege, and all authentication is handled natively by Netcatty. The plugin provides developers with a secure and convenient integration between DeepSeek and SSH/SFTP.