always use at-least 5 isolates

mobile/lib/domain/services/background_worker.service.dart

@@ -35,7 +35,6 @@ import 'package:immich_mobile/utils/http_ssl_options.dart';
 import 'package:immich_mobile/wm_executor.dart';
 import 'package:isar/isar.dart';
 import 'package:logging/logging.dart';
-import 'package:worker_manager/worker_manager.dart';
 
 class BackgroundWorkerFgService {
   final BackgroundWorkerFgHostApi _foregroundHostApi;
@@ -94,7 +93,7 @@ class BackgroundWorkerBgService extends BackgroundWorkerFlutterApi {
       await Future.wait(
         [
           loadTranslations(),
-          workerManagerForIos.init(dynamicSpawning: true),
+          workerManagerPatch.init(dynamicSpawning: true),
           _ref?.read(authServiceProvider).setOpenApiServiceEndpoint(),
           // Initialize the file downloader
           FileDownloader().configure(
@@ -199,7 +198,7 @@ class BackgroundWorkerBgService extends BackgroundWorkerFlutterApi {
       _cancellationToken.cancel();
       _logger.info("Cleaning up background worker");
       final cleanupFutures = [
-        workerManagerForIos.dispose().catchError((_) async {
+        workerManagerPatch.dispose().catchError((_) async {
           // Discard any errors on the dispose call
           return;
         }),