dsh-hub-oauth-gateway: The Localized Usage Center and Coding Subscription Gateway for DeepSeek Harness

`dsh-hub-oauth-gateway` is a plugin for DeepSeek Harness, designed to provide a localized unified hub that integrates usage records, cost monitoring, and subscription management across multiple tools. Its core features include a local dashboard and HUD (with support for heatmaps and trend analysis), account quota adaptation, OAuth login support (compatible with multiple coding subscriptions), data export, and an optional loopback API gateway. All data is stored on a local SQLite database and can be exported in CSV or JSON formats. The plugin runs with the permissions of the current process, emphasizing token privacy and data integrity, and provides users with a complete closed loop from analytics to subscription management.