Add OpenAPI 3.0 compliance validation

[RUKAYAT-CODER]

Validate API compliance with OpenAPI spec.

Acceptance Criteria:

• OpenAPI 3.0 spec generation
• Schema validation
• Response validation
• CI integration

[olaayoade27-coder]

@olaayoade27-coder has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hello maintainer i would like to work on this issue please assign me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @olaayoade27-coder to this issue.

[drips-wave]

Congratulations, @olaayoade27-coder! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @olaayoade27-coder: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

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🌊 Happy Wave 🌊

[drips-wave]

This issue has been completed by @olaayoade27-coder as part of the Stellar Wave Program's 5th Wave 🥳

😎 @olaayoade27-coder: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.