dsh-search-switcher: Quick Search Engine Switching for DeepSeek Harness

The `dsh-search-switcher` plugin provides a convenient search engine switching feature for DeepSeek Harness. It renders the switcher directly on the left side of the input area, supports instant engine switching, and offers full keyboard-only operation support. The plugin depends on `dsh-free-search` and is compatible with multiple mainstream search engines. Installation requires consideration of Node.js version requirements and compatibility issues with certain runtimes. This tool addresses the need to quickly switch data sources under network restrictions, but does not provide result previews or authentication bypass.