docs: describe NVIDIA Container Toolkit

[git-jxj]

Description

The architecture map described NVIDIA Container Toolkit as a Docker runtime, which is inaccurate and too narrow. Update it to say the Toolkit enables NVIDIA GPU support in container runtimes.

Testing

• git diff --check
• Documentation-only change; no code tests apply.

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📝 Walkthrough

Walkthrough

The Architecture component list now describes nvidia-container-toolkit as enabling NVIDIA GPU support in container runtimes instead of identifying it as a Docker runtime.

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to bfda5

The change updates the Architecture description without indicating a user-facing or operational regression. It appears ready to merge after normal checks.

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[git-jxj]

Closing this PR because its DCO sign-off uses an account handle; the contribution guide requires a real name. The patch is retained locally for a properly signed submission if the author chooses to proceed.