feat: implement initial application setup with Riverpod, GoRouter, Hive, and theme configuration

lib/main.dart

@@ -1,15 +1,11 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:media_kit/media_kit.dart';
 import 'core/database/hive_service.dart';
 import 'core/router/app_router.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
-  // Initialize MediaKit for video playback
-  MediaKit.ensureInitialized();
-
   // Initialize Hive database with encryption
   await HiveService.init();