[Docs] Add VKE docs and update P/D examples on VKE

[Jeffwan]

Pull Request Description

Add VKE doc

Related Issues

Resolves: #[Insert issue number(s)]

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[gemini-code-assist]

Summary of Changes

Hello @Jeffwan, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on enhancing documentation related to Kubernetes deployments, specifically introducing VKE (Virtual Kubelet Engine) documentation and refining existing Kubernetes examples. It also updates a key SGLang disaggregation example to reflect newer model versions and a more robust pod grouping and indexing strategy, improving the clarity and relevance of the provided deployment configurations.

Highlights

• VKE Documentation: New documentation for VKE (Virtual Kubelet Engine) is introduced, and existing Kubernetes examples are updated to align with VKE usage, enhancing clarity for advanced deployments.
• Kubernetes Example Updates: The tp-1p1d.yaml example for SGLang disaggregation has been updated to use pod-group-index for selectors and node ranking, and the example model was upgraded from Qwen2.5-7B to Qwen3-8B.
• Installation Guide Refinement: Outdated custom configuration instructions have been removed from the stable version installation guide, streamlining the installation process.
• Pod Grouping Logic: The tp-1p1d.yaml now uses replicas: 1 with podGroupSize: 2 for prefill and decode roles, indicating a refined approach to how pods are grouped and managed within the Kubernetes cluster.
• Environment Variable Addition: The UCX_TLS environment variable with value ^gga has been added to the prefill and decode containers in the Kubernetes example, potentially for network optimization.

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[gemini-code-assist]

Code Review

This pull request adds documentation for VKE and updates related examples. The documentation changes involve moving the advanced Kubernetes examples and adding a new VKE-specific document link. The example YAML for disaggregated inference is updated to use a newer model and adapt to recent API changes in aibrix, such as the introduction of pod groups. My review focuses on a potentially critical misconfiguration in the updated example.

[Jeffwan]

/cc @googs1025

[googs1025]

LGTM