refactor(mobile): services and providers (#9232)

* refactor(mobile): services and provider

* providers

mobile/lib/providers/album/current_album.provider.dart

@@ -0,0 +1,15 @@
+import 'package:immich_mobile/entities/album.entity.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'current_album.provider.g.dart';
+
+@riverpod
+class CurrentAlbum extends _$CurrentAlbum {
+  @override
+  Album? build() => null;
+
+  void set(Album? a) => state = a;
+}
+
+/// Mock class for testing
+abstract class CurrentAlbumInternal extends _$CurrentAlbum {}