dsh-token-usage: Token Usage and Cost Analysis Plugin for DeepSeek Harness

`dsh-token-usage` is a local web plugin for DeepSeek Harness (DSH) that reads persistent logs to provide developers with intuitive token usage statistics and cost estimates. The plugin offers summary cards, GitHub-style heatmaps, and actual billing calculations based on Beijing peak/off-peak periods, with support for custom per-model pricing tables. It is easy to install, stores all data locally, and does not affect Agent runtime logic.