dsh-aurora-glass: An Aurora Glass Background Beautification Plugin for DeepSeek Harness

`dsh-aurora-glass` is a lightweight independently developed plugin designed specifically for DeepSeek Harness (DSH), enhancing the visual hierarchy of the Web UI through aurora backgrounds and glassmorphism effects. It avoids performance-intensive blur pipelines and supports preset color palettes, custom local and remote images, theme-following, and a standalone settings panel. By dynamically injecting styles via Cordis, it maintains smooth interface performance, is compatible with DSH 0.2.x versions, and fully restores the default appearance after uninstallation.