feat: API 통합 2차 작업 완료

- 자동 로그인 구현: 앱 시작 시 토큰 확인 후 적절한 화면으로 라우팅
- AuthInterceptor 개선: AuthService와 통합하여 토큰 관리 일원화
- 로그아웃 기능 개선: AuthService를 사용한 API 로그아웃 처리
- 대시보드 API 연동: MockDataService에서 실제 API로 완전 전환
  - Dashboard DTO 모델 생성 (OverviewStats, RecentActivity 등)
  - DashboardRemoteDataSource 및 DashboardService 구현
  - OverviewController를 ChangeNotifier 패턴으로 개선
  - OverviewScreenRedesign에 Provider 패턴 적용
- API 통합 진행 상황 문서 업데이트

lib/screens/login/login_screen.dart

@@ -22,7 +22,11 @@ class _LoginScreenState extends State<LoginScreen> {
 
   // 로그인 성공 시 콜백 (예: overview로 이동)
   void _onLoginSuccess() {
-    Navigator.of(context).pushReplacementNamed('/home');
+    // 로그인 성공 시 모든 이전 라우트를 제거하고 홈으로 이동
+    Navigator.of(context).pushNamedAndRemoveUntil(
+      '/home',
+      (route) => false,
+    );
   }
 
   @override

lib/screens/login/widgets/login_view_redesign.dart

@@ -27,8 +27,6 @@ class _LoginViewRedesignState extends State<LoginViewRedesign>
   late AnimationController _slideController;
   late Animation<Offset> _slideAnimation;
 
-  bool _rememberMe = false;
-
   @override
   void initState() {
     super.initState();
@@ -80,36 +78,37 @@ class _LoginViewRedesignState extends State<LoginViewRedesign>
       child: Consumer<LoginController>(
         builder: (context, controller, _) {
           return Scaffold(
-      backgroundColor: ShadcnTheme.background,
-      body: SafeArea(
-        child: Center(
-          child: SingleChildScrollView(
-            physics: const BouncingScrollPhysics(),
-            child: Padding(
-              padding: const EdgeInsets.all(ShadcnTheme.spacing6),
-              child: ConstrainedBox(
-                constraints: const BoxConstraints(maxWidth: 400),
-                child: FadeTransition(
-                  opacity: _fadeAnimation,
-                  child: SlideTransition(
-                    position: _slideAnimation,
-                    child: Column(
-                      mainAxisAlignment: MainAxisAlignment.center,
-                      children: [
-                        _buildHeader(),
-                        const SizedBox(height: ShadcnTheme.spacing12),
-                        _buildLoginCard(),
-                        const SizedBox(height: ShadcnTheme.spacing8),
-                        _buildFooter(),
-                      ],
+            backgroundColor: ShadcnTheme.background,
+            body: SafeArea(
+              child: Center(
+                child: SingleChildScrollView(
+                  physics: const BouncingScrollPhysics(),
+                  child: Padding(
+                    padding: const EdgeInsets.all(ShadcnTheme.spacing6),
+                    child: ConstrainedBox(
+                      constraints: const BoxConstraints(maxWidth: 400),
+                      child: FadeTransition(
+                        opacity: _fadeAnimation,
+                        child: SlideTransition(
+                          position: _slideAnimation,
+                          child: Column(
+                            mainAxisAlignment: MainAxisAlignment.center,
+                            children: [
+                              _buildHeader(),
+                              const SizedBox(height: ShadcnTheme.spacing12),
+                              _buildLoginCard(),
+                              const SizedBox(height: ShadcnTheme.spacing8),
+                              _buildFooter(),
+                            ],
+                          ),
+                        ),
+                      ),
                     ),
                   ),
                 ),
               ),
             ),
-          ),
-        ),
-      );
+          );
         },
       ),
     );
@@ -234,7 +233,7 @@ class _LoginViewRedesignState extends State<LoginViewRedesign>
               margin: const EdgeInsets.only(bottom: ShadcnTheme.spacing4),
               decoration: BoxDecoration(
                 color: ShadcnTheme.destructive.withOpacity(0.1),
-                borderRadius: BorderRadius.circular(ShadcnTheme.borderRadius),
+                borderRadius: BorderRadius.circular(ShadcnTheme.radiusMd),
                 border: Border.all(
                   color: ShadcnTheme.destructive.withOpacity(0.3),
                 ),