dsh-command-palette: A Keyboard-First Command Palette for DeepSeek Harness

The `dsh-command-palette` plugin for DeepSeek Harness (DSH) is designed to streamline daily DSH management through keyboard shortcuts. It provides a command palette invoked by a double Shift hotkey, supports one-click switching and management of sessions, workspaces, and settings, and allows users to customize frequently used commands. Built on the DSH standard Client service, it does not rely on Electron and is compatible with the standard DSH Web Profile. Additionally, it offers a standard extension interface that allows other plugins to register commands, enabling functional integration.