Reads the last hwfit scan's backend (window._hwfitSystemCache.backend)
and picks the right vLLM install path per vendor:
- NVIDIA/CUDA (default)
- uv: uv pip install -U vllm --torch-backend auto
- docker: docker pull vllm/vllm-openai:latest
- AMD/ROCm
- uv: uv pip install -U vllm --torch-backend rocm
- docker: docker pull rocm/vllm-dev:main
The <pre> previews are re-painted on render to match what Run will
actually launch, and the confirm dialog tags the backend so the user
knows what they're committing to.
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