feat(ai-gateway): AI Semantic Response Guard plugin

[tomek-labuk]

Description

Fixes #2196

Preview Links

https://deploy-preview-2757--kongdeveloper.netlify.app/plugins/ai-semantic-response-guard/unreleased/
https://deploy-preview-2757--kongdeveloper.netlify.app/plugins/ai-semantic-response-guard/examples/allow-and-deny-responses/unreleased
https://deploy-preview-2757--kongdeveloper.netlify.app/plugins/ai-semantic-response-guard/examples/allow-responses/unreleased
https://deploy-preview-2757--kongdeveloper.netlify.app/plugins/ai-semantic-response-guard/examples/deny-responses/unreleased
https://deploy-preview-2757--kongdeveloper.netlify.app/plugins/ai-semantic-response-guard/examples/allow-and-deny-responses-pgvector/unreleased

Checklist

• Tested how-to docs. If not, note why here.
• All pages contain metadata.
• Any new docs link to existing docs.
• All autogenerated instructions render correctly (API, decK, Konnect, Kong Manager).
• Style guide (capitalized gateway entities, placeholder URLs) implemented correctly.
• Every page has a description entry in frontmatter.
• Add new pages to the product documentation index (if applicable).

[netlify]

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