add entities

[nottherealalanturing]

🚀 PR: Asset Module Suite Implementation

This PR introduces a comprehensive suite of asset management features including core Asset CRUD operations, Transfer handling, and Checkout workflows.

🔧 Asset Module

• Implements full CRUD for asset records
• Supports metadata, file uploads, QR code generation, and relationships
• Adds advanced filtering and full-text search capabilities

🔁 Asset Transfer System

• Enables initiating, approving, and tracking asset transfers between users
• Maintains ownership history and state transitions
• Triggers notifications for key transfer events

📦 Asset Checkout Functionality

• Allows users to check out and return assets
• Tracks usage history and enforces overdue rules
• Sends automated notifications for overdue items

All modules include proper service layers, controller endpoints, and relational integrity with the User and Asset entities.

closes #13, #14, #15