dsh-usage-analytics: A Local-First Personal Usage Analytics Plugin

`dsh-usage-analytics` is a localized usage analytics plugin designed specifically for the DeepSeek Harness (DSH) Web platform, released under the MIT license. It requires no remote services and provides visualized data insights on the settings page by computing local indexes. Core features include bar charts, heatmaps, and calendar views with 1/7/30-day window switching, as well as model distribution, skill invocation details, and token composition analysis. The plugin strictly adheres to privacy-first principles: it writes only derived data, stores no original content, and supports cache rebuilding to maintain data accuracy.