docs: add NPU Operator entry

[fyuan1316]

Summary by CodeRabbit

• Documentation
  • Added NPU Operator guide covering Kubernetes operator functionality for Ascend driver/firmware management, runtime configuration, device plugin integration, and workload resource allocation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e227d67d-d923-4ad0-8602-4d0b805fe675

📥 Commits

Reviewing files that changed from the base of the PR and between a14879f and a5f8bf6.

📒 Files selected for processing (1)

• docs/en/infrastructure_management/device_management/npu_operator.mdx

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Walkthrough

A new MDX documentation page is added for the Alauda Build of NPU Operator. It describes the operator's function as a Kubernetes operator that reconciles Ascend driver/firmware, container runtime configuration, MindCluster device plugin, and an optional NPU exporter via the NPUOperatorCtl custom resource, along with supported workload resource names.

Changes

NPU Operator Documentation

Layer / File(s)	Summary
NPU Operator docs page docs/en/infrastructure_management/device_management/npu_operator.mdx	New MDX page describing the NPU Operator's components, NPUOperatorCtl custom resource, huawei.com/Ascend910 and huawei.com/Ascend310P resource names, and an external reference link.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇 A hop through the docs, a new page appears,
The NPU Operator lands with a cheer!
With Ascend and drivers all neatly aligned,
NPUOperatorCtl leaves no config behind.
The rabbit types fast, then wiggles its ears~ ✨

🚥 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 'docs: add NPU Operator entry' directly and accurately describes the main change—adding documentation for the NPU Operator. It is concise, clear, and specific.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/add-npu-operator-entry

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