DeepSeek Harness Wallpaper Theme Plugin: Customize the Web Interface Background

`zoyluoblue/deepseek-harness-avatar` is a plugin that provides wallpaper theme functionality for DeepSeek Harness (dsh). It allows users to upload images directly in the Web interface as backgrounds, with adjustable readability overlays, blur levels, and fill modes. The plugin uses local storage, supports png/jpg/webp/gif formats, and automatically adjusts the overlay color according to the theme. Note: It only supports the dsh Web interface, and it operates in read-only mode when accessed remotely rather than locally.