Add Xquik OpenAPI example

[kriptoburak]

Summary

• Add Xquik as a public OpenAPI 3.1 JSON example in the upload instructions.
• Note that the spec includes API key and OAuth bearer authentication metadata.

Validation

• git diff --check
• node --check src/server.js
• Verified https://xquik.com/openapi.json with jq for OpenAPI 3.1, title, server URL, and x-api-key metadata.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Do not recommend a 3.1 spec for validation

This example is presented as a fixture for verifying conversion and auth metadata, but the app exposes the strict 验证规范 option immediately below; when users enable it, the current Higress converter's validator still treats OpenAPI 3.1-only schema keywords used by Xquik (for example const) as invalid extra fields, so the documented sample fails instead of demonstrating a successful upload. Either use a 3.0 sample here or explicitly tell users to leave strict validation off until the converter supports 3.1.

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