dsh-oai-oauth: DSH Plugin for ChatGPT Subscription via OAuth

dsh-oai-oauth is an adapter plugin for DeepSeek Harness (DSH), designed to replace traditional API key requests by reusing local Codex CLI login credentials and OpenAI OAuth subscription permissions, providing a more convenient LLM invocation experience. After installing and enabling the plugin, users can select OpenAI ChatGPT (OAuth) in the model settings of the web interface to log in and start using it. The plugin code is open source under the MIT license and is suitable for users who already have a ChatGPT subscription, but they should pay attention to its runtime permissions and source code security.