dsh-webui-launcher: Web UI Launcher for DeepSeek Harness

`dsh-webui-launcher` is a plugin for DeepSeek Harness (DSH) designed to simplify launching and managing the Web UI. Through Slash commands, Model tools, and setting cards, it enables background control of the Web UI lifecycle, and supports automatically opening a browser and creating desktop shortcuts. It offers flexible configuration, defaults to binding to the local loopback address for security, and can run silently in headless environments.