feat: 초기 프로젝트 설정 및 LunchPick 앱 구현

LunchPick(오늘 뭐 먹Z?) Flutter 앱의 초기 구현입니다.

주요 기능:
- 네이버 지도 연동 맛집 추가
- 랜덤 메뉴 추천 시스템
- 날씨 기반 거리 조정
- 방문 기록 관리
- Bluetooth 맛집 공유
- 다크모드 지원

기술 스택:
- Flutter 3.8.1+
- Riverpod 상태 관리
- Hive 로컬 DB
- Clean Architecture

🤖 Generated with Claude Code

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

lib/presentation/pages/main/main_screen.dart

@@ -0,0 +1,88 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import '../../../core/constants/app_colors.dart';
+import '../../../core/services/notification_service.dart';
+import '../../providers/notification_handler_provider.dart';
+import '../share/share_screen.dart';
+import '../restaurant_list/restaurant_list_screen.dart';
+import '../random_selection/random_selection_screen.dart';
+import '../calendar/calendar_screen.dart';
+import '../settings/settings_screen.dart';
+
+class MainScreen extends ConsumerStatefulWidget {
+  final int initialTab;
+  
+  const MainScreen({super.key, this.initialTab = 2});
+
+  @override
+  ConsumerState<MainScreen> createState() => _MainScreenState();
+}
+
+class _MainScreenState extends ConsumerState<MainScreen> {
+  late int _selectedIndex;
+  
+  @override
+  void initState() {
+    super.initState();
+    _selectedIndex = widget.initialTab;
+    
+    // 알림 핸들러 설정
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      NotificationService.onNotificationTap = (NotificationResponse response) {
+        if (mounted) {
+          ref.read(notificationHandlerProvider.notifier).handleNotificationTap(
+            context,
+            response.payload,
+          );
+        }
+      };
+    });
+  }
+  
+  @override
+  void dispose() {
+    NotificationService.onNotificationTap = null;
+    super.dispose();
+  }
+  
+  final List<({IconData icon, String label})> _navItems = [
+    (icon: Icons.share, label: '공유'),
+    (icon: Icons.restaurant, label: '맛집'),
+    (icon: Icons.casino, label: '뽑기'),
+    (icon: Icons.calendar_month, label: '기록'),
+    (icon: Icons.settings, label: '설정'),
+  ];
+  
+  final List<Widget> _screens = [
+    const ShareScreen(),
+    const RestaurantListScreen(),
+    const RandomSelectionScreen(),
+    const CalendarScreen(),
+    const SettingsScreen(),
+  ];
+  
+  @override
+  Widget build(BuildContext context) {
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+    
+    return Scaffold(
+      body: IndexedStack(
+        index: _selectedIndex,
+        children: _screens,
+      ),
+      bottomNavigationBar: NavigationBar(
+        selectedIndex: _selectedIndex,
+        onDestinationSelected: (index) {
+          setState(() => _selectedIndex = index);
+        },
+        backgroundColor: isDark ? AppColors.darkSurface : AppColors.lightSurface,
+        destinations: _navItems.map((item) => NavigationDestination(
+          icon: Icon(item.icon),
+          label: item.label,
+        )).toList(),
+        indicatorColor: AppColors.lightPrimary.withOpacity(0.2),
+      ),
+    );
+  }
+}