DeepSeek Harness Plugin: dsh-plugin-usage-meter (API Usage/Cost/Balance Dashboard)

`dsh-plugin-usage-meter` is a community plugin designed specifically for the DeepSeek Harness (dsh) web interface, aiming to solve the problems of cost accounting and budget monitoring after API usage. The plugin is approximately 0.6MB in size, requires no Electron or separate process, and is mounted through the official profile mechanism—without modifying source code and can be easily uninstalled. Core features include displaying real-time token usage below the input box, cost estimation based on official listed prices, and account balance queries (API Key configuration required). It provides bar charts showing model cost distribution for the current day and the past 7 days, supports peak/off-peak pricing, and offers dual-currency display in CNY/USD. Users can connect to the official billing from `platform.deepseek.com` to verify actual charges, and historical costs automatically...