Backend: Enhance Rate Limit Headers

[Abdulazeem-code]

Description: Expose standard rate limit headers to clients so they know when they will be throttled.

Acceptance Criteria:

• API responses include X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset headers.

Branching Instructions: Create branch feat/rate-limit-headers from main.

[Silver36-ship-it]

@Silver36-ship-it has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I would love to work on this professionally, please assign it to me

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[drips-wave]

Congratulations, @Johnsource-hub! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @Johnsource-hub: 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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[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @Johnsource-hub as part of the Stellar Wave Program's 8th Wave 🥳

Moderator's reason: [Auto-assessed] The PR was merged on 2026-08-07T14:16:46Z and directly addresses the acceptance criteria by enabling legacy headers in the rate-limit middleware and updating the test suite to verify their presence. The earlier maintainer requests to resolve conflicts were clearly satisfied prior to the merge.

😎 @Johnsource-hub: 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.

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ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.