dsh-plugin-api-quota: View DeepSeek API Balance in the Web Interface Sidebar

`dsh-plugin-api-quota` is a DeepSeek Harness (DSH) Web UI plugin for quickly checking your API balance in the sidebar. It is integrated at the bottom of the sidebar and supports displaying the total balance, acquired balance, and a refresh function. The API key is handled on the host side to ensure security. Installation involves three steps: building, registering the configuration, and creating a symbolic link. After installation, users can quickly verify their balance in the web interface without manual login, improving workflow efficiency.