DeepSeek Harness Web Floating Usage Panel Plugin

`dsh-deepseek-usage-panel` is an MIT-licensed open-source DeepSeek Harness plugin. It adds a macOS-style floating panel to the DSH web interface, displaying official balance and local token usage statistics in real time. The plugin supports drag-and-drop positioning, automatic collapsing, multi-dimensional chart visualizations (including model share), and secure API key configuration. Regarding data scope, token statistics are locally measured values, so absolute totals may deviate from official values due to incomplete observation windows; focusing on relative trends is therefore recommended.