dsh-knj-menu: DeepSeek Harness Third-Party Menu Manager

`dsh-knj-menu` is a third-party menu manager for DeepSeek Harness (DSH), designed to address the fragmentation of third-party plugin menus. It consolidates the entry points declared by `dsh.bundle`, providing persistent, collapsible, and pinned functionality to help users keep the interface tidy. Installation must be performed via the DSH command-line tool and requires the necessary environment dependencies. As a plugin that runs with the permissions of the current process, it is recommended to review the source code before installation.