Add Xquik request and response validation fixture

[kriptoburak]

Summary

• Adds a compact Xquik OpenAPI search fixture to validator tests.
• Verifies document validation, request validation, API key security, and response validation.

Validation

• go test . -run TestXquikSearchFixture_ValidateRequestAndResponse
• go test ./...

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.97%. Comparing base (e8302f2) to head (75dae8e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #299   +/-   ##
=======================================
  Coverage   97.97%   97.97%           
=======================================
  Files          67       67           
  Lines        7670     7670           
=======================================
  Hits         7515     7515           
  Misses        127      127           
  Partials       28       28           

Flag	Coverage Δ
unittests	97.97% <ø> (ø)

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[daveshanley]

I can't see what value this adds?

[kriptoburak]

Thanks for the direct feedback. I agree this is not adding enough maintainer value as a branded fixture, so I am closing it rather than keeping noise in your queue.