dsh-hotkey: Configurable Keyboard Shortcuts for DSH Desktop Web GUI

`dsh-hotkey` is a keyboard shortcut plugin for DSH Desktop Web GUI, designed to reduce mouse dependency through VS Code-style configuration. The plugin supports 20 actions and provides a visual editor, conflict detection, and multilingual support, with navigation enhancement features. It depends on certain prerequisite plugins to unlock specific features and persists its configuration. Developers can debug it via the DevTools interface and run tests using `npm test`.