feat: add llm-katan to k8s deploy

[JaredforReal]

What this PR does / why we need it:

• add llm-katan to k8s deploy
• separate core and llm-katan mode, as what we do in Docker Compose deploy
• update README and docs
• expand pvc size
• fix inference-pool selector error

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[github-actions]

👥 vLLM Semantic Team Notification

The following members have been identified for the changed files in this PR and have been automatically assigned:

📁 deploy

Owners: @rootfs, @Xunzhuo
Files changed:

• deploy/kubernetes/base/kustomization.yaml
• deploy/kubernetes/deployment.katan.yaml
• deploy/kubernetes/overlays/core/kustomization.yaml
• deploy/kubernetes/overlays/llm-katan/kustomization.yaml
• deploy/kubernetes/README.md
• deploy/kubernetes/ai-gateway/inference-pool/inference-pool.yaml
• deploy/kubernetes/config.yaml
• deploy/kubernetes/deployment.yaml
• deploy/kubernetes/kustomization.yaml
• deploy/kubernetes/pvc.yaml

📁 website

Owners: @Xunzhuo, @rootfs, @yuluo-yx
Files changed:

• website/docs/installation/kubernetes.md

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🎉 Thanks for your contributions!

This comment was automatically generated based on the OWNER files in the repository.

[yossiovadia]

look solid for moving forward, but consider adding validation for the Qwen model download and possibly making the init container more robust in handling download failures, but it can be a future enhancement.