feat(assets): implement asset registration module with CRUD APIs

[mdauwal]

Implement Asset Registration Module #233

Overview

This PR introduces the Asset Registration Module, enabling the registration and management of organizational assets.
It provides full CRUD functionality and establishes relationships with related entities (categories, suppliers, and departments).

✨ Features Implemented

• Entity: Defined Asset entity with the following fields:
  • serialNumber
  • purchaseDate
  • supplierId
  • warrantyEnd
  • assignedDepartmentId
• DTOs: Added create and update DTOs with validation.
• Service: Implemented service logic for asset registration, updates, deletion, and retrieval.
• Controller: Exposed RESTful API endpoints for asset CRUD operations.
• Relations: Linked assets with categories, suppliers, and departments.

✅ Acceptance Criteria

• Assets table created with required fields
• CRUD APIs functional for registering/updating assets
• Assets linked to categories, suppliers, and departments

🔗 Related Issue

Closes #233

[vercel]

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