Add Transaction Dispute System

[llinsss]

Description:
Allow users to dispute transactions and track resolution.

Tasks:

• Create dispute model
• Add dispute submission endpoint
• Implement dispute workflow
• Add admin dispute management
• Send dispute notifications

Files to create:

• backend/models/Dispute.js
• backend/controllers/disputeController.js

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[dreamgene]

@dreamgene has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

dreamegene here, please assign me to solve this

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[Meshmulla]

@Meshmulla has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

hello sir, i would like to resolve this issue sir

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Congratulations, @Meshmulla! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

🧑‍💻 @Meshmulla: 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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This issue has been completed by @Meshmulla as part of the Stellar Wave Program's 2nd Wave 🥳

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