- Add Sync navigation tab in settings
- Sync UI with status cards (total, vTiger, e-conomic)
- Action cards for vTiger and e-conomic sync
- Sync log with real-time updates
- JavaScript functions for sync operations
- Backend sync router with vTiger account sync
- Backend vTiger contacts sync with customer linking
- Placeholder for e-conomic sync (needs get_customers method)
- Name normalization for company matching
- CVR number matching and validation
