add multi_npu_qwen3_dense tutorials

[wind-many]

What this PR does / why we need it?

Does this PR introduce any user-facing change?

How was this patch tested?

• vLLM version: v0.11.2
• vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.2

[github-actions]

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[gemini-code-assist]

Code Review

This pull request adds a new tutorial for running Qwen3-32B-W8A8 on multiple NPUs. The documentation is comprehensive and well-structured. I've found one significant issue in an environment setup script that could lead to incorrect configuration for users on Ubuntu. I've provided a suggestion to make the script more robust by automatically detecting the correct library path.