DeepSeek Harness Main Program Version Management Plugin dsh-versions: Safe Upgrades and Rollbacks

The dsh-versions plugin addresses the lack of a rollback mechanism when upgrading the DeepSeek Harness main program. It allows users to view versions and check for updates in the web interface, and supports online installation, reinstallation, and downgrading. With automatic snapshots and second-level rollback, it significantly reduces upgrade risk. The installation requires dsh ≥ 0.1.0 and is Windows-only (as it depends on Windows tools); users on other platforms need to run npm commands manually.