[BE-23] Implement GET /assets - list assets with filters and pagination

[yusuftomilola]

Overview

Implement the list assets endpoint with filtering and pagination inside backend/contrib/.

Location

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

Acceptance Criteria

• GET /assets endpoint implemented with query params: search, status, condition, categoryId, departmentId, page (default 1), limit (default 20)
• search performs multi-column ILIKE across: name, assetId, serialNumber, manufacturer, model
• Soft-deleted assets excluded by default (withDeleted: false)
• Returns paginated response: { data: Asset[], total: number, page: number, limit: number }
• Uses QueryBuilder with leftJoinAndSelect for relations

[ayshadogo]

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

Hello,
I am aysha, a backend developer with experience in NestJS, ExpressJS, and Node.js.
I would like to contribute to this issue and resolve it.
Thank you.

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

[drips-wave]

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

🧑‍💻 @ayshadogo: 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 @ayshadogo as part of the Stellar Wave Program's 4th Wave 🥳

😎 @ayshadogo: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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