dsh-llm-mimo: Xiaomi MiMo v2.5 adapter for DeepSeek Harness

`dsh-llm-mimo` is an LLM Seam plugin for DeepSeek Harness (DSH) designed to support the Xiaomi MiMo v2.5 model. This plugin resolves the HTTP 400 error in the original fork and supports Chain of Thought, multi-turn conversations, tool calling, and SSE streaming. Installation must be performed via the command line and requires configuring the `MIMO_API_KEY`, with a dependency on `dsh-llm` version ^0.1.1-rc.2. After installation, manually restart the DSH process and select the model in the GUI.