Wire IP whitelist middleware for admin endpoints

[hman38705]

Issue 002: Wire IP whitelist middleware for admin endpoints

Area: Backend
Priority: Critical
Files: services/api/src/main.rs, services/api/src/security.rs

Problem

IpWhitelist is initialized but never used in the middleware stack. Admin endpoints are accessible from any IP.

Acceptance Criteria

• Admin routes enforce IP whitelist when configured\n- Non-whitelisted IPs return 403 Forbidden\n- Behavior is documented and tested\n- Whitelist is configurable via environment variable

[Macnelson9]

@Macnelson9 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi, can I work on this issue please? I will deliver timely and efficiently. ETA: 1hr

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Congratulations, @Macnelson9! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Macnelson9: 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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This issue has been completed by @Macnelson9 as part of the Stellar Wave Program's 4th Wave 🥳

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