docs(vllm-omni): note ARM64 not supported; flag GLM-Image as experimental (cherry-pick of #8373)

[ayushag-nv]

Overview:

Cherry-pick of #8373 onto release/1.1.0.

Doc-only update to docs/backends/vllm/vllm-omni.md:

• Note that vLLM-Omni is not currently installed on arm64 builds.
• Flag zai-org/GLM-Image as experimental — generation may fail or produce incorrect outputs for some prompts/sizes.

No code changes.

Details:

Cherry-pick of squash-merged commit 8291bfcc951785a6791f1705a90dedb3ec4f337b from main onto release/1.1.0. Applied cleanly (no conflicts); single file, +6 / -2 lines in docs/backends/vllm/vllm-omni.md.

Where should the reviewer start?

• docs/backends/vllm/vllm-omni.md — the only file changed.

Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

• Cherry-pick of docs(vllm-omni): note ARM64 not supported; flag GLM-Image as experimental #8373
• Relates to DYN-2741: dynamo/release-1.1.0/vllm-runtime/arm64 — vllm-omni module missing from arm64

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