test: add current Xquik OpenAPI coverage and fix sample schema

[kriptoburak]

Summary

• Add a compact, current Xquik OpenAPI 3.1 example spec.
• Verify code mode loads an API-key-protected OpenAPI 3.1 spec and finds its search operation.
• Fix the existing JSONPlaceholder sample response schema to describe user objects instead of strings.

Accuracy

• Match the live Xquik search contract: a 200-result limit, cursor and sort parameters, and current pagination fields.
• Include the required X Corp. independence and trademark disclosure.

Validation

• pnpm build
• pnpm test - 35 tests passed
• pnpm typecheck
• Parsed both changed YAML examples successfully.
• Compared the Xquik example against https://xquik.com/openapi.yaml.
• git diff --check

[kriptoburak]

Pushed 5d5e192 with the full repair.

• Refreshed the Xquik example against the live OpenAPI 3.1 contract.
• Added the required independence and trademark disclosure.
• Fixed the unrelated sample-spec defect where /users declared user objects as strings.
• Verified pnpm build, pnpm test (35 tests), pnpm typecheck, YAML parsing, and git diff --check.