Add per-endpoint CORS override configuration

[Chucks1093]

Summary
Add per-endpoint CORS override configuration

Scope

• support endpoint-specific CORS policy overrides\n- keep secure defaults unchanged\n- document override usage examples

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

[nice-bills]

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

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[Uchechukwu-Ekezie]

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

Please assign this issue to me

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

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[drips-wave]

This issue has been completed by @Uchechukwu-Ekezie as part of the Stellar Wave Program's 4th Wave 🥳

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