dsh-wsl-docker: WSL Docker Engine Diagnostics and vLLM Container Checks

The DeepSeek Harness (DSH) plugin `dsh-wsl-docker` is used to automatically diagnose the status of Docker and vLLM containers in WSL environments. It provides a `docker_doctor` tool that supports checking Docker paths, daemon configuration, context, and vLLM container operation. Developers can quickly troubleshoot local model deployment environments with simple commands, reducing debugging time. The plugin requires DSH version ≥ 0.1.2, can be installed via a command, and is available for use after restarting the service.