dsh-relay-models: Mixed-Protocol Model Discovery, Metadata Completion, and Configuration Plugins

`dsh-relay-models` is a DeepSeek Harness plugin designed to simplify the cumbersome configuration of custom protocols. It provides a Web interface, supports automatic matching of model metadata from pi.dev, and allows users to reorder provider lists via drag-and-drop or keyboard shortcuts. Additionally, the plugin supports manual overrides for Headers and User-Agent, as well as customizable settings for provider model capabilities. After installation, restart and refresh are required, and Headers must be saved separately.