DeepSeek Harness Plugin: dsh-wsl-vllm

`dsh-wsl-vllm` is a plugin for DeepSeek Harness (DSH) designed to simplify access to and interaction with vLLM services in WSL. It integrates vLLM's OpenAI-compatible interface, using port 8000 by default, into the DSH ecosystem and can be installed via the `dsh plugin` command. The plugin provides `vllm_status` to check service status and model loading state, and `vllm_chat` for chat completion. It supports Docker execution and configuration via environment variables. Ensure that your DSH version is ≥ 0.1.2 and that you have access to the service.