adding packages

experimental/pocketbase_sync/lib/sync/pb_multi_sync_manager.dart

@@ -0,0 +1,40 @@
+import 'dart:async';
+import 'package:logging/logging.dart';
+import 'pb_sync_manager.dart';
+import '../core/sync_interface.dart';
+
+class PocketBaseMultiSyncManager implements ISyncManager {
+  final Map<Type, PocketBaseSyncManager> _managers = {};
+  final _logger = Logger('PocketBaseMultiSyncManager');
+
+  /// Registers a manager for a specific type [T].
+  void register<T>(PocketBaseSyncManager<T> manager) {
+    _managers[T] = manager;
+  }
+
+  /// Retrieves the manager for type [T].
+  PocketBaseSyncManager<T> managerFor<T>() {
+    final manager = _managers[T];
+    if (manager == null) {
+      throw StateError('No SyncManager registered for type $T');
+    }
+    return manager as PocketBaseSyncManager<T>;
+  }
+
+  @override
+  Future<void> sync() async {
+    _logger.info('Starting multi-sync for ${_managers.length} managers');
+    // Run syncs sequentially to avoid overwhelming network/device resources.
+    // Could be parallelized with Future.wait if needed.
+    for (final manager in _managers.values) {
+      try {
+        await manager.sync();
+      } catch (e, stack) {
+        // Log error but continue syncing other collections
+        _logger.severe(
+            'Error syncing manager for type ${manager.runtimeType}', e, stack);
+      }
+    }
+    _logger.info('Multi-sync completed');
+  }
+}