docs: add Search API response examples

[basit3407]

Split out from PR #167 so Search API response examples can be reviewed independently.

Scope:

• Adds Search 200 response examples for advanced results, no results, and quick navigation.
• Adds documented JSON content/examples for common 400, 401, and 403 responses.
• Adds a Search error response schema matching the service error envelope.

Local validation:

• Parsed openAPI/search/v1.json with Node.
• Checked every Search JSON response has a top-level example.
• git diff --check

Hosted validation:

• Cloudflare Pages passed.

[cloudflare-workers-and-pages]

Deploying qf-api-docs with    Cloudflare Pages

Latest commit:	008dee5
Status:	✅  Deploy successful!
Preview URL:	https://54ebc887.qf-api-docs.pages.dev
Branch Preview URL:	https://codex-search-response-exampl.qf-api-docs.pages.dev

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