DeepSeek Harness: ChatGPT Subscription Login and Network Configuration Plugin

The `dsh-chatgpt-subscription` plugin for DeepSeek Harness (DSH) is designed to address login and network connection issues that developers encounter when using a ChatGPT subscription. It supports direct connections or Clash proxy mode, uses OAuth login with automatic renewal, and eliminates the need to manually manage API keys. Users must configure the network mode in the settings, complete browser login, and specify `gpt-6.1-sol` as the main Agent model. Installation is performed via terminal commands, and the application must be restarted after installation. Note that this plugin is compatible only with DSH Desktop 0.2.0-rc.2 on Windows, and login credentials must be kept secure.