dsh-analytics: DSH's Agent FinOps / token analytics plugin

`dsh-analytics` is a local Agent FinOps plugin for DeepSeek Harness (DSH), designed to address the challenges of tracking multi-session, multi-model invocations, and scattered cache costs. By collecting usage data from session events and writing it to a local SQLite database, combined with a time-aware pricing table for cost calculation, the plugin enables localized data storage and analysis without relying on external APIs. Its core features include a local usage ledger, a time-aware cost engine, multi-dimensional query interfaces (Service, Agent Tool, JSON API), and a browser dashboard. The dashboard supports overview, session drill-down, model and tool cost analysis, and budget monitoring, offering selectable time ranges from 6 hours to the full duration and Chinese/English language switching. The plugin adopts step-level attribution...