dsh-plugin-subs: DeepSeek Harness Subscription Integration Plugin

`dsh-plugin-subs` is a DeepSeek Harness (DSH) plugin designed to connect directly to consumer subscriptions such as Claude and ChatGPT Plus through an OAuth flow, eliminating the need to manually configure API keys. It supports model parsing, streaming output, and tool calling, and is easy to install. Users need only connect and authorize the provider in Settings to use their existing subscriptions for model inference in DSH. The plugin is suitable for users who want to simplify API management, but please be aware of provider-specific limitations and configuration requirements for Chinese platforms.