dsh-bt-panel-theme: Provides Baota Panel Theme and Embedded Entry for DeepSeek Harness

`dsh-bt-panel-theme` is a DeepSeek Harness Web plugin designed to provide an integrated experience for developers managing servers using the BaoTa panel. Its main functions include switching the Harness interface to the BaoTa green light or dark theme and embedding BaoTa panel pages into Harness via API configuration, validation, and an automatic login mechanism. This enables seamless switching within a single workspace, minimizing window jumps. Upon activation, the homepage displays as "BaoTa Version" and the left menu adds an entry for "BaoTa Panel". The plugin reuses Harness's existing ports without adding new listening ports, and the embedded pages support state persistence. The environment requires Node.js 20+ and configuration of the BaoTa Panel API whitelist. Installation involves cloning the repository locally and executing `dsh plugin --p`