test: add Xquik OpenAPI 3.1 codegen coverage

[kriptoburak]

Summary

• Add OpenAPI codegen coverage for an Xquik search endpoint.
• Verify operation naming, query parameter schemas, and response schema extraction.

Testing

• Installed dependencies with npm legacy peer resolution because the existing dependency tree has an ESLint peer conflict.
• npx vitest run packages/openapi-codegen/src/parser.test.ts
• npx tsc -p packages/openapi-codegen/tsconfig.json

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[kriptoburak]

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