[BE-172] Dispute filing has no check that the filer owns the document

[mftee]

Overview

BE-90/BE-54 built dispute-filing endpoints, but backend/src/dispute/dispute.controller.ts doesn't appear to verify the requester is the document's owner (or an admin) before allowing a dispute to be filed against it — any authenticated user could file a dispute on someone else's document.

Tasks

• Add an ownership/admin check in DisputeController's create endpoint
• Add a test asserting a non-owner, non-admin user gets 403 when filing a dispute on another user's document

Acceptance Criteria

• Filing a dispute on a document you don't own and aren't an admin for returns 403

Notes for Contributors

Comment below to be assigned.

[amberly-d]

@amberly-d has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, I'd like to take this on.

I'm a software engineer with strong experience in JavaScript and building scalable web applications. I'm comfortable working across the stack, writing clean, maintainable code, and collaborating in open source environments.

I've gone through the details of this issue and I'm confident I can deliver a clean, well-tested solution that fits the codebase.

Please assign this issue to me, I'd be happy to contribute.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@amberly-d's PR #1225 was approved and merged by @mftee.

🏆 @amberly-d: You earned 40 FoxPoints for this contribution! Your current tier: Builder (1,268 total points). Track your full progress on GrantFox.

👏 Great work, @amberly-d! Keep contributing to CodeGirlsInc.

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This issue has been completed by @amberly-d as part of the Stellar Wave Program's 8th Wave 🥳

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