[BACKEND] Implement Asset Location Tracking Module

[yusuftomilola]

Track physical asset locations. Each asset can have a current location (branch, warehouse, GPS coordinates for vehicles).

Expected Behavior:

• Table asset_locations with assetId, branchId, gpsCoordinates.
• API to update current location.
• Query assets by location.

Tasks:

• Generate asset-locations module.
• Define entity & DTOs.
• Add service + controller endpoints.

[mftee]

I will like to work on this issue