Scaffold Block Seasons Flutter app

flutter create (com.airkjw.blockseasons, iOS+Android), Riverpod,
shared_preferences, audioplayers, gen-l10n EN/KO wiring, app shell
with Home -> Game placeholder.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

lib/app.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+
+import 'l10n/gen/app_localizations.dart';
+import 'ui/screens/home_screen.dart';
+
+class BlockSeasonsApp extends StatelessWidget {
+  const BlockSeasonsApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      onGenerateTitle: (context) => AppLocalizations.of(context)!.appTitle,
+      debugShowCheckedModeBanner: false,
+      localizationsDelegates: const [
+        AppLocalizations.delegate,
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+      ],
+      supportedLocales: const [Locale('en'), Locale('ko')],
+      theme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(
+          seedColor: const Color(0xFF5B7FFF),
+          brightness: Brightness.dark,
+        ),
+        useMaterial3: true,
+      ),
+      home: const HomeScreen(),
+    );
+  }
+}