Campaign banner/image upload to object storage

[joelpeace48-cell]

Epic: Backend Platform

Summary

Support uploading campaign media to S3-compatible storage with validation + CDN URLs.

Background & Problem

Rich campaign pages need media; direct DB blobs don't scale.

Acceptance Criteria

• Uploads validated (type/size) + stored in object storage.
• Served via CDN URLs.
• Cleanup on campaign delete.

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Filed as part of the mainnet-readiness & world-class roadmap. Scope is intentionally small enough for one focused PR; comment to claim.

[damianosakwe]

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

Hello maintainer i would like to work on this issue

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

[Dove1010]

@Dove1010 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Can I work on this?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Dove1010 to this issue.

[drips-wave]

Congratulations, @Dove1010! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @Dove1010: 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

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

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