`AuthService` challenge TTL desync

[dDevAhmed]

• 📚 Overview: Refine and implement: AuthService challenge TTL desync
• 🎯 Objectives:
  • Implement Implementation needed
  • Add unit tests
  • Verify with protocol invariants
• 🧠 Problem Context: Issue identified during audit: - Impact: Redis TTL vs memory TTL mismatch.
• 🧩 Technical Scope: Relevant repository module.
• ✅ Acceptance Criteria:
  • Implementation needed is functional
  • Tests passed
  • No regressions
• 🔐 Security / Integrity Considerations: Not specified
• ⏳ Complexity & Effort: Medium
• 🔗 References: Internal Ref #BE-182
• 🏷️ Labels: backend, stellar-wave, complexity-medium

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[mikkyvans0-source]

@mikkyvans0-source has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hello am a full-stack blockchain dev will ng to work on this project

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mikkyvans0-source to this issue.

[drips-wave]

Congratulations, @mikkyvans0-source! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @mikkyvans0-source: 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.

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