perf(app): 초기화 병렬 처리 및 UI 개선

## 성능 최적화

### main.dart
- 앱 초기화 병렬 처리 (Future.wait 활용)
- 광고 SDK, Hive 초기화 동시 실행
- Hive Box 오픈 병렬 처리
- 코드 구조화 (_initializeHive, _initializeNotifications)

### visit_provider.dart
- allLastVisitDatesProvider 추가
- 리스트 화면에서 N+1 쿼리 방지
- 모든 맛집의 마지막 방문일 일괄 조회

## UI 개선

### 각 화면 리팩토링
- AppDimensions 상수 적용
- 스켈레톤 로더 적용
- 코드 정리 및 일관성 개선

lib/presentation/pages/splash/splash_screen.dart

@@ -15,10 +15,8 @@ class SplashScreen extends StatefulWidget {
 }
 
 class _SplashScreenState extends State<SplashScreen>
-    with TickerProviderStateMixin {
-  late List<AnimationController> _foodControllers;
-  late AnimationController _questionMarkController;
-  late AnimationController _centerIconController;
+    with SingleTickerProviderStateMixin {
+  late AnimationController _animationController;
   List<Offset>? _iconPositions;
   Size? _lastScreenSize;
 
@@ -42,24 +40,9 @@ class _SplashScreenState extends State<SplashScreen>
   }
 
   void _initializeAnimations() {
-    // 음식 아이콘 애니메이션 (여러 개)
-    _foodControllers = List.generate(
-      foodIcons.length,
-      (index) => AnimationController(
-        duration: Duration(seconds: 2 + index % 3),
-        vsync: this,
-      )..repeat(reverse: true),
-    );
-
-    // 물음표 애니메이션
-    _questionMarkController = AnimationController(
-      duration: const Duration(milliseconds: 500),
-      vsync: this,
-    )..repeat();
-
-    // 중앙 아이콘 애니메이션
-    _centerIconController = AnimationController(
-      duration: const Duration(seconds: 1),
+    // 단일 컨트롤러로 모든 애니메이션 제어 (메모리 최적화)
+    _animationController = AnimationController(
+      duration: const Duration(seconds: 2),
       vsync: this,
     )..repeat(reverse: true);
   }
@@ -142,9 +125,9 @@ class _SplashScreenState extends State<SplashScreen>
               children: [
                 // 선택 아이콘
                 ScaleTransition(
-                  scale: Tween(begin: 0.8, end: 1.2).animate(
+                  scale: Tween(begin: 0.9, end: 1.1).animate(
                     CurvedAnimation(
-                      parent: _centerIconController,
+                      parent: _animationController,
                       curve: Curves.easeInOut,
                     ),
                   ),
@@ -164,11 +147,11 @@ class _SplashScreenState extends State<SplashScreen>
                   children: [
                     Text('오늘 뭐 먹Z', style: AppTypography.heading1(isDark)),
                     AnimatedBuilder(
-                      animation: _questionMarkController,
+                      animation: _animationController,
                       builder: (context, child) {
                         final questionMarks =
                             '?' *
-                            (((_questionMarkController.value * 3).floor() % 3) +
+                            (((_animationController.value * 3).floor() % 3) +
                                 1);
                         return Text(
                           questionMarks,
@@ -217,29 +200,30 @@ class _SplashScreenState extends State<SplashScreen>
 
     return List.generate(foodIcons.length, (index) {
       final position = _iconPositions![index];
+      // 각 아이콘마다 위상(phase)을 다르게 적용
+      final phase = index / foodIcons.length;
 
       return Positioned(
         left: position.dx,
         top: position.dy,
-        child: FadeTransition(
-          opacity: Tween(begin: 0.2, end: 0.8).animate(
-            CurvedAnimation(
-              parent: _foodControllers[index],
-              curve: Curves.easeInOut,
-            ),
-          ),
-          child: ScaleTransition(
-            scale: Tween(begin: 0.5, end: 1.5).animate(
-              CurvedAnimation(
-                parent: _foodControllers[index],
-                curve: Curves.easeInOut,
+        child: AnimatedBuilder(
+          animation: _animationController,
+          builder: (context, child) {
+            // 위상 차이로 각 아이콘이 다른 타이밍에 애니메이션
+            final value =
+                ((_animationController.value + phase) % 1.0 - 0.5).abs() * 2;
+            return Opacity(
+              opacity: 0.2 + value * 0.4,
+              child: Transform.scale(
+                scale: 0.7 + value * 0.5,
+                child: child,
               ),
-            ),
-            child: Icon(
-              foodIcons[index],
-              size: 40,
-              color: AppColors.lightPrimary.withOpacity(0.3),
-            ),
+            );
+          },
+          child: Icon(
+            foodIcons[index],
+            size: 40,
+            color: AppColors.lightPrimary.withValues(alpha: 0.3),
           ),
         ),
       );
@@ -274,11 +258,7 @@ class _SplashScreenState extends State<SplashScreen>
 
   @override
   void dispose() {
-    for (final controller in _foodControllers) {
-      controller.dispose();
-    }
-    _questionMarkController.dispose();
-    _centerIconController.dispose();
+    _animationController.dispose();
     super.dispose();
   }
 }