dsh-homepage-skin: DeepSeek Harness Homepage Background Skin

The DeepSeek Harness plugin `dsh-homepage-skin` adapts the local interface to match the visual style of the official DeepSeek website. Through code injection, it adds background elements such as flowing light effects, a dot-line grid, and a digital whale, along with a glassmorphic sidebar. It supports light and dark theme switching. After installation, restart the process and enable the plugin in the settings. The plugin modifies only the background and sidebar without affecting the layout, supports responsive hiding animations on mobile devices, and is licensed under the MIT License.