dsh-model-menu-search: DeepSeek Harness Model Menu Real-Time Search

`dsh-model-menu-search` is a plugin specifically designed for DeepSeek Harness. It addresses the inefficiency of locating models in long lists by adding a real-time search box at the top of the model menu. The plugin supports filtering by name substring, normalized matching, abbreviations, and vendor prefixes (e.g., `@bailian`), and is compatible with keyboard navigation. It uses semantic DOM targeting to adapt to version updates, offers zero dependencies, zero errors thrown, and automatic viewport clamping, and can be installed through a local symbolic link.