dsh-restart-btn: DeepSeek Harness One-Click Restart Plugin

The DSH plugin dsh-restart-btn adds a "Restart Web Service" button to the General settings section, reusing the desktop launcher mechanism to resolve issues where scheduled tasks silently fail because of non-ASCII paths. It supports cross-platform compatibility, includes automatic restart, port conflict handling, and readiness validation, and provides API access and a bilingual user interface. By standardizing the restart process, the plugin helps developers quickly apply changes made to bundles or configuration settings.