- AssetService: assignToSubscriber, assignToTechnician, returnAsset, disposeAsset, getAssetHistory
- getCurrentLocation helper derives location from latest movement
- Disposal validates ADMIN role and creates write-off JE (DR 5030, CR 1200)
- API routes: POST assign, POST return, POST dispose, GET history
- Location history resolves subscriber/technician/warehouse names
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>