SyncService class abstract

Service interface for sync operations.

Handles synchronization of location data with remote servers, including offline queue management and retry logic.

Example:

// Trigger immediate sync
await Locus.sync.now();

// Listen to sync events
Locus.sync.events.listen((event) {
  if (event.success) {
    print('Synced ${event.count} locations');
  } else {
    print('Sync failed: ${event.statusCode}');
  }
});

// Set sync policy
await Locus.sync.setPolicy(SyncPolicy(
  minBatteryLevel: 20,
  requireWifi: true,
  maxRetries: 3,
));

// Enqueue custom payload
await Locus.sync.enqueue({
  'type': 'check-in',
  'locationId': 'store-123',
});