DeepSeek Harness Plugin: Balance Monitoring and Budget Estimation for opencode.go and commandcode

`lbwfff/dsh-usage-estimator` is a dual-endpoint plugin for DeepSeek Harness, designed to provide zero-configuration quota monitoring for opencode.go and commandcode. It supports real-time quota indicators, budget estimation tables based on official pricing, and runs entirely locally. The plugin fetches data through Host-side routing and Browser-side polling, is privacy-preserving, and requires no additional deployment.