DeepSeek Harness Plugin: Draggable OpenCodex Quota and Rate Monitoring Floating Card

`dsh-opencodex-usage` is a monitoring plugin for DeepSeek Harness, designed to address the pain point of developers frequently checking API quotas and costs. With a freely draggable floating capsule, it provides an intuitive view of OpenCodex rate limits, remaining quotas, and cost statistics. It supports monitoring of five major providers, automatic configuration detection, and dark theme compatibility, delivering real-time data without manual refresh to effectively improve development efficiency.