dsh-usage-indicator: Real-Time DeepSeek Usage and Balance Indicator

In the DeepSeek Harness ecosystem, `dsh-usage-indicator` is a sidebar plugin designed to monitor remaining context capacity and account balance in real time. Its core features include a context usage progress bar that changes color when approaching the threshold, an account balance warning line, and a compaction countdown based on the EMA algorithm. Data processing remains a local closed loop, and API keys never leave the local machine. Users can adjust the full-bar quota and warning line via a Web panel, with configuration changes taking effect immediately. Installation requires DSH and pnpm to be installed, and the compaction threshold must align with `dsh-compaction-basic`.