refactor(architecture): centralize bloc files into dedicated folder

lib/bloc/main_bloc.dart

@@ -0,0 +1,31 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:sfm_app/product/base/bloc/base_bloc.dart';
+import '../feature/bell/bell_model.dart';
+
+class MainBloc extends BlocBase {
+  final bellBloc = StreamController<Bell>.broadcast();
+  StreamSink<Bell> get sinkBellBloc => bellBloc.sink;
+  Stream<Bell> get streamBellBloc => bellBloc.stream;
+
+
+  final language = StreamController<Locale?>.broadcast();
+  StreamSink<Locale?> get sinkLanguage => language.sink;
+  Stream<Locale?> get streamLanguage => language.stream;
+  
+  final theme = StreamController<ThemeData?>.broadcast();
+  StreamSink<ThemeData?> get sinkTheme => theme.sink;
+  Stream<ThemeData?> get streamTheme => theme.stream;
+
+  final themeMode = StreamController<bool>.broadcast();
+  StreamSink<bool> get sinkThemeMode => themeMode.sink;
+  Stream<bool> get streamThemeMode => themeMode.stream;
+
+  final isVNIcon = StreamController<bool>.broadcast();
+  StreamSink<bool> get sinkIsVNIcon => isVNIcon.sink;
+  Stream<bool> get streamIsVNIcon => isVNIcon.stream;
+
+  @override
+  void dispose() {}
+}