dsh-all-usage: DeepSeek Harness Full Usage Dashboard

The `dsh-all-usage` plugin is designed to meet the need for tracking token consumption and analyzing costs in DeepSeek Harness (DSH). It provides a visual usage dashboard that supports statistics on tokens, cache, and costs by model, provider, and workspace, and includes a 53-week heatmap, trend line charts, and data export functionality. Compatible with the DSH desktop client and Node.js environments, it supports automatic workspace following and incremental reading. Developers can use this tool for usage auditing and cost control, but should note that costs are model-based estimates rather than official billing figures, and historical data from unregistered workspaces is displayed as aggregated.