Add Xquik analyzer example

[kriptoburak]

Summary

Adds examples/xquik.json, a compact OpenAPI 3.1 example for public tweet search, user profile lookup, and trends routes. Adds a build-output Node test that checks analyzer validation, operations, statistics, and security scheme extraction.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing behavior to change)
• Documentation update
• Build / CI / tooling change

Related issues

None.

Checklist

• I have read the Contributing Guidelines
• My commits are signed off (git commit -s) per the DCO
• I have added or updated tests as needed
• I have updated the CHANGELOG.md under an Unreleased section
• I have run npm run build && npm run test:integration locally and it passes
• I have updated relevant documentation under docs/

Validation

• Parsed the fixture with jq.
• Ran npm ci.
• Ran npm run build.
• Ran Node's test runner for tests/analyzer-xquik.test.mjs.

Notes: I did not run the server-starting integration suite for this example-only change.

[kriptoburak]

If this is useful and you merge it after checks pass, feel free to share the PR on X/Twitter and mention my handle, burakbayir. I can repost or retweet it to my 24k followers of developers and power users, which may help more relevant users discover this repo.