DeepSeek Harness Web Background Plugin: Deep-Sea Whale Girl Theme and Custom Frosted Glass Effect

`dsh-whale-background` is an extension for DSH Web GUI that provides a deep-sea whale girl theme with a frosted glass effect. It supports custom local or remote background images, includes an opacity slider to adjust the frosted glass intensity, and offers both `contain` and `cover` background fit modes. All settings are persisted in the browser's `localStorage`; no external resources are required, and it is compatible with the MIT License. After installation, users can freely change the wallpaper or restore defaults from the settings page to personalize the visual appearance of the Web interface.