dsh-desktop: A Windows companion plugin for DeepSeek Harness providing system tray, desktop window, and auto-start

# Introduction For developers using the DeepSeek Harness (DSH) Web profile on Windows, the daily workflow is roughly as follows: open the terminal, execute `dsh web`, wait for the service to start, and then switch to the browser to access it. There is no system tray icon, no desktop shortcut, and everything resets after a computer restart. To create a traditional "desktop client," one would need to maintain an additional chain for downloading, installing, and updating. dsh-desktop changed its approach: turning the desktop experience into a Web plugin. DSH's philosophy is "everything is a plugin," and the desktop is no exception—it is provided as a Web plugin, requiring no separate installation of an independent desktop client, and no administrator privileges are required throughout. After installing the plugin, restart the Web profile...