@shatyuka/dsh-llm-codebuddy: Integrate Tencent CodeBuddy login and model list for dsh

`@shatyuka/dsh-llm-codebuddy` is a DeepSeek Harness (dsh) plugin maintained by shatyuka and licensed under the MIT License, designed to seamlessly integrate Tencent CodeBuddy into the dsh ecosystem. Its core advantage is that it requires no API key, allowing users to access the CodeBuddy model list by logging in directly through a browser. The plugin supports automated credential injection via the `Sign in` button in the Web UI's `Settings → CodeBuddy`, as well as login, status checks, and logout operations via the terminal using the `dsh-codebuddy-login` command. Ensure your local Node version is `^22.1` before installation.