Update search API response schema with highlight documentation

[mintlify]

Summary

• Updated the search API response schema to accurately reflect the actual response structure
• Added documentation for the new exact-match highlighting feature that returns windowed snippets with <mark><b> tags around matched query terms
• Added detailed field descriptions including page, header, content, metadata (with title, breadcrumbs, icon, hash, openapi), and score

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Note

Low Risk
Spec-only change in discovery-openapi.json, with no runtime logic touched; primary risk is breaking generated clients/consumers that relied on the previous (incorrect) schema.

Overview
Updates the Search API response contract in the OpenAPI spec. The 200 response for /v1/search/{domain} changes from a top-level array to an object containing results.

Each result is now fully documented with page, header, highlighted content (using <mark><b> tags), richer metadata (title, breadcrumbs, icon, hash, openapi), and a numeric relevance score.

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