Auto-update NVIDIA device plugin version in README

[Copilot]

README hardcoded NVIDIA device plugin at v0.13.0 while K3s/CUDA versions auto-updated via workflow. Users received stale installation instructions.

Changes

• Workflow: Fetch latest NVIDIA device plugin release from GitHub API

  - name: Get latest NVIDIA device plugin version
    id: nvidia_plugin
    run: |
      latest=$(curl -s \
        "https://api.github.com/repos/NVIDIA/k8s-device-plugin/releases/latest" \
        | jq -r '.tag_name')
      echo "latest=$latest" >> $GITHUB_OUTPUT

• README update: Extended awk pattern to replace version in kubectl command

  /kubectl apply -f https:\/\/raw\.githubusercontent\.com\/NVIDIA\/k8s-device-plugin\// {
    sub(/v[0-9]+\.[0-9]+\.[0-9]+/, nvidia_plugin); print; next
  }

• Immediate fix: Bumped v0.13.0 → v0.18.2

Workflow now maintains version consistency across all components.

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