dsh-provider-auto: DeepSeek Harness Inference Model Auto-Configuration Plugin

`dsh-provider-auto` is a DeepSeek Harness (DSH) plugin designed to address the issue where custom OpenAI-compatible gateways cannot display reasoning controls in the frontend. It identifies models by name (e.g., `gpt-5*`, `o1*`, etc.) and automatically injects the `reasoningEfforts` configuration for eligible models, supporting four levels: off, low, medium, and high. The plugin supports protocol listening and declaration retention, and default rules can be overridden via a configuration file. It requires a Node.js 22+ environment.