[BE-39] Implement asset borrowing check-out and check-in endpoints

[yusuftomilola]

Overview

Implement a borrowing/check-out system that allows users to borrow assets for a set period inside backend/contrib/.

Location

All work must be inside backend/contrib/src/borrowing/.

Acceptance Criteria

• Borrowing entity: id, assetId, borrowedBy (FK → User), checkedOutAt, expectedReturnAt, returnedAt (nullable), notes, status (ACTIVE, RETURNED, OVERDUE)
• POST /assets/:id/checkout — CheckOutDto: expectedReturnAt*, notes?; sets asset status to ASSIGNED
• POST /assets/:id/checkin — marks borrowing as RETURNED, sets returnedAt, restores asset status to ACTIVE
• GET /borrowings — lists all borrowing records with optional filters (status, userId)
• All endpoints protected by JwtAuthGuard

[OmniZlatoon]

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

I would like to work on this project. I assure you completion and efficiency in the outcome of this work.

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[ummarig]

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

Let me professionally implement this task as soon as possible

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

[drips-wave]

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

🧑‍💻 @ummarig: 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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[drips-wave]

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

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