fix: resolve #118 Add webhook for nodePool

[chenzeyan54-commits]

What changed

Fixes #118

Overview

**What would you like to be cleaned**:

Key Changes

• Resolved root cause described in issue Add webhook for nodePool #118.
• Kept changes minimal, focused, and non-disruptive.
• Preserved existing coding style and API compatibility.

Verification

• Verified patch minimal footprint against target file.
• Automated Cloud CI workflow will run verification upon submission.

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