Add route-level request size diagnostics log

[Chucks1093]

Summary
Add route-level request size diagnostics log

Scope

• add structured diagnostics log for oversized request payload rejections\n- include route context and configured limits\n- avoid logging full payload content

Acceptance Criteria

• scoped change is implemented with no unrelated file churn
• docs/tests are updated where applicable
• contributor can validate the outcome locally

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

[Meet-hybrid]

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

This application represents both a chance to make an impact and a step toward achieving my career and personal aspirations.

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

[harystyleseze]

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

i would like to work on this

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

[drips-wave]

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

🧑‍💻 @harystyleseze: 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 @harystyleseze as part of the Stellar Wave Program's 4th Wave 🥳

😎 @harystyleseze: 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.

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