dsh-session-admin: DeepSeek Harness Session Management Plugin

dsh-session-admin is a session management plugin for DeepSeek Harness, designed to address the inconvenience of managing sessions in the official interface. It provides a global view through a Web settings panel, supporting session viewing, searching, archiving, restoring, and batch deletion. Users can install it by running a command and restarting the service to enable it. It also offers a RESTful API for automated integration. Please note that a service restart is required after installation and that deletion operations are irreversible.