DSH Usage Dashboard Plus: DSH Web Sidebar Balance and Today's Spending Plugin

dsh-usage-dashboard-plus is a web plugin for DSH, designed to address API balance monitoring and cost statistics issues. It displays the DeepSeek API balance and today's estimated spending at the bottom of the sidebar, and provides a comprehensive usage analysis panel. The plugin supports viewing call volume, latency, throughput, and token consumption broken down by model, and can include external vision model calls in cost estimation. Core features include today's cost estimation based on price tables, peak/off-peak pricing plan support, call log filtering with a 500-row limit and CSV export, as well as historical statistics implementation inherited from Stats. Installation requires executing the `dsh plugin` command in the web configuration and restarting the service; if migrating from the old dsh-stats-dashboard, the old plugin must be removed first.