[BE-43] Implement asset tags update and global search endpoint

[yusuftomilola]

Overview

Implement an asset tags management endpoint and a global asset search endpoint inside backend/contrib/.

Location

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

Acceptance Criteria

• PATCH /assets/:id/tags accepts { tags: string[] }, replaces the asset tags array, returns updated asset
• GET /assets/search accepts ?q= query string, performs full-text search across name, assetId, serialNumber, manufacturer, model, description, tags
• Search results ranked by relevance (exact assetId match ranked first)
• Both endpoints protected by JwtAuthGuard

[Mkalbani]

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

Hi, Can I work on this

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

[drips-wave]

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

🧑‍💻 @Mkalbani: 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.

Warning

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