yuhao-pet: Add an interactive, points-earning desktop pet "Yuhao" to DSH Web GUI

yuhao-pet is a DSH Web GUI community plugin based on the MIT license, maintained by dlpufan. It introduces a desktop pet named "YuHao" that resides permanently in the bottom-right corner of the interface, supporting drag-and-drop, hiding, and integration with the Cyberpunk theme plugin. The plugin aims to transform daily interactions into a lightweight pet care process. Its core functions include five categories of state management (such as hunger and cleanliness), executing actions like feeding, bathing, and studying, as well as a leveling and experience system. Specifically, it converts token consumption into credits for users to purchase food and props in the store. Additionally, the plugin supports configuring a DeepSeek API Key for AI dialogue, features a local history log, and enables Spine dynamic character art, expression switching, outfit changes, and various interactive tools. Installation requires entering the source code directory and executing `dsh plugi`.