omdsh-usage: API Consumption Overview of the DeepSeek Harness Web Interface

The `omdsh-usage` plugin displays API costs in the DeepSeek Harness interface, enabling monitoring of sessions, projects, and account balance. It shows a three-digit spending badge in the Chat/Work mode session header and in the Code mode corner; hovering over it reveals a token breakdown. Data is retrieved via the `omdshUsage` projection unit and the `/summary` endpoint, with pricing calculated on the host side. Configuration options include currency, model rate tables, night discounts, and low-balance thresholds. The plugin depends on `omdsh-sidepanel`, requires Node.js 22.19.0 or later, and supports custom rates and caching.