docs: add Cluster Autoscaler solution documentation

[chinameok]

Add comprehensive documentation for the alert-driven cluster autoscaler solution, including architecture overview, installation guide, configuration steps, verification procedures, and troubleshooting.

Key sections:

• Architecture overview with workflow diagram
• Prerequisites and constraints
• Installation and configuration guide
• Verification and monitoring
• FAQ and troubleshooting checklist

Summary by CodeRabbit

• Documentation
  • Added comprehensive documentation for the Cluster Autoscaler solution, covering system architecture and design, installation prerequisites and step-by-step procedures, detailed configuration guide for webhook features and notification rules, verification and monitoring instructions with metrics guidance, troubleshooting resources including frequently asked questions and remedies, example YAML configurations, CLI command reference, and visual workflow diagrams.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Adds comprehensive documentation for the Cluster Autoscaler solution within Alauda Container Platform, including architecture overview, installation procedures, configuration guidance, verification methods, and troubleshooting information with practical examples and YAML manifests.

Changes

Cohort / File(s)	Summary
Documentation – Cluster Autoscaler Solution docs/en/solutions/ait/cluster-autoscaler-solution.md	New document (+576 lines) covering architecture, prerequisites, installation, configuration, verification, monitoring, and FAQ sections for the Cluster Autoscaler solution. Includes YAML examples, CLI commands, Mermaid flowchart, and troubleshooting guidance.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Suggested reviewers

• tyzhou111
• fanzy618

Poem

🐰 A new guide hops into place,
Cluster scaling finds its grace,
With diagrams, configs, and care,
Documentation's everywhere!
Your clusters shall autoscale with ease,
Thanks to docs that aim to please.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title clearly and concisely summarizes the main change: adding documentation for the Cluster Autoscaler solution, which aligns perfectly with the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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[van0828]

/lgtm