dsh-codex-auth: A ChatGPT Authorization Plugin for DeepSeek Harness

The `dsh-codex-auth` plugin provides ChatGPT/Codex authorization capabilities for DeepSeek Harness, allowing users to sign in through official services and enable the `openai-codex` model. The plugin handles login orchestration, secure interfaces, and metadata reading, and must be installed via a `.tgz` package. When using it, note that the browser interface only reads metadata and does not include the Token, and when migrating from an older version, residual Windows Junction links must be removed to avoid permission errors.