[Backend] Marketplace dispute resolution and arbitration

[Penielka]

Overview

Marketplace transactions can go wrong (non-delivery, misrepresentation). Add a dispute flow: buyers open disputes, evidence is attached, a mediator/adjudicator resolves with refund or release, and the escrow contract is invoked accordingly.

Acceptance Criteria

• Buyers can open disputes against a marketplace listing
• Evidence attachment and messaging within a dispute
• Mediator resolution triggers refund or release via escrow
• Dispute lifecycle is audit-logged and surfaced to admins
• Escalation path from automated rules to human mediator

Files to Modify

• backend/src/services/disputes/ — dispute service
• backend/src/models/Dispute.ts — new model
• backend/src/routes/disputes.ts — endpoints
• contracts/src/marketplace.rs — escrow resolution hooks

Priority: Medium

[indubala0103-hue]

Good day Dev, I can gracefully implement a dispute flow to your project. Kindly assign

[grantfox-oss]

🦊 GrantFox — @indubala0103-hue has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #394)
2. Your PR will be reviewed by the AetherEdu maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@indubala0103-hue's PR #488 was approved and merged by @Penielka.

🏆 @indubala0103-hue: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (80 total points). Track your full progress on GrantFox.

👏 Great work, @indubala0103-hue! Keep contributing to AetherEdu.