Add Xquik OpenAPI ingest test

[kriptoburak]

Summary

• Adds a focused Xquik OpenAPI 3.1 fixture for an API-key protected search operation.
• Verifies ingestion preserves version, metadata, tag, required query param, enum values, and integer parameter typing.

Validation

• git diff check
• python3 -m pytest tests/test_ingest_openapi.py

Notes

• Duplicate check found no existing Xquik entry, PR, or issue in this repository.