Update Kubernetes standalone setup guide to match latest implementation

[kaushalkahapola]

Purpose

Describe the problems, issues, or needs driving this feature/fix and include links to related issues in the following format: Resolves issue1, issue2, etc.

Resolves #370

The Kubernetes Standalone Mode setup guide (kubernetes-standalone.md, both 1.2.0 and next versions) documented payloads and commands that no longer match the current gateway implementation — outdated flags, incorrect Helm values paths, and an LLM provider example that didn't reflect the current API shape. This PR brings the guide in line with the current implementation.

Checklist

• Verified that llms.txt (located at en/docs/llms.txt) is updated for AI readiness content.
• Ensured meaningful alt text for images and that the information contained in an image also appears in text so the relevant info exists in the body of the document.
• Added or updated frontmatter for the respective pages.

Goals

Describe the solutions that this feature/fix will introduce to resolve the problems described above

Align the Kubernetes Standalone Mode guide's commands, Helm values paths, and the LLM provider deploy/invoke example with the current gateway implementation, so users following the guide end up with a working setup.

Approach

Describe how you are implementing the solutions.

Updated the guide content directly (prose, helm/kubectl commands, and YAML examples) to match the current chart values and management API, and refreshed the last_updated frontmatter field. No UI changes.

User stories

Summary of user stories addressed by this change

As a user following the Kubernetes Standalone Mode guide, I can run the documented commands and payloads as written and get a working AI Gateway deployment, without needing to guess at corrected flags or fields.

Release note

Brief description of the new feature or bug fix as it will appear in the release notes

Updated the Kubernetes Standalone Mode setup guide so its commands and payloads match the current implementation.

Documentation

Link(s) to product documentation that addresses the changes of this PR.

This PR is the documentation change — updates en/docs/ai-gateway/1.2.0/deployment/deployment-modes/kubernetes/kubernetes-standalone.md and en/docs/ai-gateway/next/deployment/deployment-modes/kubernetes/kubernetes-standalone.md.

Training

N/A — no training content impact.

Certification

N/A — no certification exam impact.

Marketing

N/A — no marketing content impact.

Automation tests

N/A — documentation-only change, no code changes.

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines: N/A (docs-only change)
• Ran FindSecurityBugs plugin and verified report: N/A (docs-only change)
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets: yes

Samples

N/A

Related PRs

None

Migrations (if applicable)

N/A

Test environment

Verified the rendered Markdown and YAML/code blocks for correctness and consistency against the current gateway Helm chart and management API; not applicable to JDK/OS/browser environments since this is a documentation-only change.

Learning

Compared the previous guide content against the current gateway Helm chart values and management API behavior to identify and correct the outdated commands and payloads referenced in #370.

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All committers have signed the CLA.