dsh-go-usage: Monitoring OpenCode GO Subscription Usage in DeepSeek Harness

`dsh-go-usage` is a DeepSeek Harness (DSH) web plugin designed to integrate OpenCode GO subscription usage monitoring directly into the development interface, avoiding context switching. The plugin displays a collapsible badge in the bottom-right corner of the DSH interface, showing usage percentage, reset countdown, and status (color changes according to usage), and supports rolling, weekly, and monthly views. Installation requires a Windows system, a Node.js environment, and local authentication configuration. The plugin retrieves the key by reading the local `auth.json`, ensuring data security, and automatically adapts to the theme. The project is licensed under the MIT License and can be installed from npm or from source.