docs: add hami_host_gpu_memory_controller_utilization_ratio to host metrics table

[manoj-1407]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
hami_host_gpu_memory_controller_utilization_ratio was added to vGPUmonitor in Project-HAMi/HAMi#2616 but the real-time-device-usage.md doc only listed hami_host_gpu_utilization_ratio and hami_host_gpu_memory_used_bytes in the host-level metrics table. added the missing entry so operators know the metric exists and what labels it carries.

Which issue(s) this PR fixes:
related to Project-HAMi/HAMi#2616

Checklist:

• npm run lint and npm run format:check pass
• npm run build succeeds for both en and zh
• Chinese translation updated if English docs changed (or noted why not) — no zh equivalent for this page
• Commits are signed off (git commit -s)

Summary by CodeRabbit

• Documentation
  • Added the host-level GPU memory controller utilization ratio metric to the real-time device usage monitoring guide.
  • Included a description and usage example for the new metric.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: manoj-1407
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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: ce62bda8-c2f8-4f20-af15-47ef2a27b2cc

📥 Commits

Reviewing files that changed from the base of the PR and between 17b81a9 and 70e0776.

📒 Files selected for processing (1)

• docs/userguide/monitoring/real-time-device-usage.md

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📝 Walkthrough

Walkthrough

The real-time device usage monitoring guide now documents the host GPU memory controller utilization ratio metric.

Changes

Monitoring documentation

Layer / File(s)	Summary
Host metric documentation docs/userguide/monitoring/real-time-device-usage.md	Documents hami_host_gpu_memory_controller_utilization_ratio, its 0–100 utilization range, and a Prometheus label example.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 70e07

This is a narrowly scoped documentation update that adds a missing host metric entry without changing product behavior; no actionable merge-blocking risk remains beyond normal checks and review.

Possibly related PRs

• Project-HAMi/website#498: Adds HAMi v2.9 metric names to the same monitoring documentation.
• Project-HAMi/website#516: Adds a host-level metric to the same monitoring section.
• Project-HAMi/website#738: Updates related GPU memory metrics in the same documentation.

Suggested reviewers: ntheanh201

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the documentation update and the specific host metric added.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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