[Fresh 2026-04][Backend] Auth: JWT key rotation + JWK endpoint (cache headers + rollover tests)

[Baskarayelu]

Description

Implement key rotation and JWK endpoint with correct caching and rollover behavior.

Requirements and context

• Backend-only; secure; tested.

Suggested execution

• Branch: feature/jwk-rotation-fresh
• Implement: src/services/, src/routes/, src/config/
• Tests: tests/

Example commit message

feat(auth): add JWT key rotation and JWK endpoint

Guidelines

• Timeframe: 96 hours

[almuslavish]

@almuslavish has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I will like to work on this pls

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

[drips-wave]

Congratulations, @almuslavish! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @almuslavish: 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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