dsh-api-usage-dashboard: Out of the box DSH model usage dashboard

`dsh-api-usage-dashboard` is a DeepSeek Harness client plugin maintained by LENS-Views. It does not require interface configuration, does not read API keys, and does not make external requests; instead, it directly aggregates session logs from `~/.dsh/sessions` on the local machine. It provides a 24-hour token bar chart, drill-down by day, provider and model color coding, model sparklines, and a detailed table in the sidebar. Installation is performed via the `install_bundle` command in the DSH Plugin Manager. Simply enter the package name `dsh-api-usage-dashboard`, or you can specify a local directory or `github:LENS-Views/dsh-api-usage-dashboard`. The three configurations (`cacheTtlMs`, `maxSessions`, and `scanConcurrency`) all have default values. The statistics cover call counts and input/cache/output/total tokens, with same-named models from different providers counted separately. The plugin only registers a route for `127.0.0.1`. Currently, there is no monetary value field; please verify the source code and license before installation.