dsh-command-douyin: Open Douyin Web Version with `/douyin` in DSH Sessions

dsh-command-douyin is a DSH plugin designed to optimize the operation chain for "opening the web version of Douyin." By registering the global `/douyin` command, users can directly trigger the default browser to open `https://www.douyin.com/?recommend=1` in a DSH Web session without going through a model inference round. This plugin is released under the MIT license and supports Windows, macOS, and Linux platforms, utilizing `runNativeCommand` for cross-system invocation and accepts no additional parameters. During installation, note that due to Node ESM relying on real path resolution, it is recommended to use the real directory to copy the plugin to the shared `node_modules` and update the `cordi