@eddyskywalker/dsh-chatgpt-subscription: Enable GPT Model Usage in DSH via ChatGPT Subscription

`@eddyskywalker/dsh-chatgpt-subscription` is a plugin for DSH that integrates ChatGPT subscriptions into DSH by registering the `codex-chatgpt` provider. It allows users to access GPT series models using the current host user's ChatGPT OAuth login state, supporting login management, quota viewing, search, image generation, and sub-agent configuration. In terms of security, tokens are encrypted and stored using DPAPI on Windows and with `0600` permissions files on Linux. Tokens do not enter browsers, configurations, or logs, and are only sent to the official OAuth endpoint. The plugin fixes the model interface, supports streaming responses, tool invocation, and multiple shell compatibility, providing including `g