refactor(App, navigation): migrate to Expo Router and clean up navigation structure

- Updated App entry point to utilize Expo Router, simplifying the navigation setup.
- Removed legacy navigation components and services to streamline the codebase.
- Adjusted package.json to reflect the new entry point and updated dependencies for compatibility.
- Enhanced overall application structure by consolidating navigation logic and improving maintainability.

app/(app)/(tabs)/_layout.tsx

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+import { Platform, useWindowDimensions } from 'react-native';
+import { Tabs } from 'expo-router';
+import { MaterialCommunityIcons } from '@expo/vector-icons';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
+
+import { colors, shadows } from '../../../src/theme';
+import { BREAKPOINTS } from '../../../src/hooks/useResponsive';
+import { useTotalUnreadCount } from '../../../src/stores';
+
+const TAB_BAR_HEIGHT = 64;
+const TAB_BAR_MARGIN = 14;
+const TAB_BAR_FLOATING_MARGIN = 12;
+
+export default function TabsLayout() {
+  const { width } = useWindowDimensions();
+  const insets = useSafeAreaInsets();
+  const unreadCount = useTotalUnreadCount();
+  const hideTabBar = Platform.OS === 'web' && width >= BREAKPOINTS.desktop;
+
+  return (
+    <Tabs
+      screenOptions={{
+        headerShown: false,
+        tabBarActiveTintColor: colors.primary.main,
+        tabBarInactiveTintColor: colors.text.secondary,
+        tabBarStyle: hideTabBar
+          ? { display: 'none', height: 0, overflow: 'hidden' }
+          : {
+              position: 'absolute',
+              left: TAB_BAR_MARGIN,
+              right: TAB_BAR_MARGIN,
+              bottom: TAB_BAR_FLOATING_MARGIN + insets.bottom,
+              height: TAB_BAR_HEIGHT,
+              borderRadius: 24,
+              backgroundColor: colors.background.paper,
+              ...shadows.lg,
+              borderTopWidth: 0,
+              elevation: 100,
+              zIndex: 100,
+            },
+        tabBarShowLabel: true,
+        tabBarLabelStyle: { fontSize: 12, fontWeight: '600', marginTop: -2 },
+      }}
+    >
+      <Tabs.Screen
+        name="home"
+        options={{
+          title: '首页',
+          tabBarIcon: ({ color, focused }) => (
+            <MaterialCommunityIcons
+              name={focused ? 'home' : 'home-outline'}
+              size={focused ? 26 : 24}
+              color={color}
+            />
+          ),
+        }}
+      />
+      <Tabs.Screen
+        name="messages"
+        options={{
+          title: '消息',
+          tabBarBadge: unreadCount > 0 ? (unreadCount > 99 ? 99 : unreadCount) : undefined,
+          tabBarIcon: ({ color, focused }) => (
+            <MaterialCommunityIcons
+              name={focused ? 'message-text' : 'message-text-outline'}
+              size={focused ? 26 : 24}
+              color={color}
+            />
+          ),
+        }}
+      />
+      <Tabs.Screen
+        name="schedule"
+        options={{
+          title: '课表',
+          tabBarIcon: ({ color, focused }) => (
+            <MaterialCommunityIcons name="calendar-today" size={focused ? 26 : 24} color={color} />
+          ),
+        }}
+      />
+      <Tabs.Screen
+        name="profile"
+        options={{
+          title: '我的',
+          tabBarIcon: ({ color, focused }) => (
+            <MaterialCommunityIcons
+              name={focused ? 'account' : 'account-outline'}
+              size={focused ? 26 : 24}
+              color={color}
+            />
+          ),
+        }}
+      />
+    </Tabs>
+  );
+}

app/(app)/(tabs)/home/_layout.tsx

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+import { Stack } from 'expo-router';
+
+export default function HomeStackLayout() {
+  return <Stack screenOptions={{ headerShown: false }} />;
+}

app/(app)/(tabs)/home/index.tsx

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+import { HomeScreen } from '../../../../src/screens/home';
+
+export default function HomeRoute() {
+  return <HomeScreen />;
+}

app/(app)/(tabs)/home/search.tsx

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+import { SearchScreen } from '../../../../src/screens/home';
+
+export default function HomeSearchRoute() {
+  return <SearchScreen />;
+}

app/(app)/(tabs)/messages/_layout.tsx

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+import { Stack } from 'expo-router';
+
+export default function MessagesStackLayout() {
+  return <Stack screenOptions={{ headerShown: false }} />;
+}

app/(app)/(tabs)/messages/index.tsx

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+import { MessageListScreen } from '../../../../src/screens/message';
+
+export default function MessagesRoute() {
+  return <MessageListScreen />;
+}

app/(app)/(tabs)/messages/notifications.tsx

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+import { NotificationsScreen } from '../../../../src/screens/message';
+
+export default function NotificationsRoute() {
+  return <NotificationsScreen />;
+}

app/(app)/(tabs)/profile/_layout.tsx

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+import { Stack } from 'expo-router';
+import { useRouter } from 'expo-router';
+
+import { AppBackButton } from '../../../../src/components/common';
+import { colors } from '../../../../src/theme';
+
+const headerOptions = {
+  headerStyle: { backgroundColor: colors.background.paper },
+  headerTintColor: colors.text.primary,
+  headerTitleStyle: { fontWeight: '600' as const },
+  headerShadowVisible: false,
+  headerBackTitle: '',
+};
+
+export default function ProfileStackLayout() {
+  const router = useRouter();
+
+  return (
+    <Stack
+      screenOptions={{
+        ...headerOptions,
+        headerBackVisible: false,
+        headerLeft: () => <AppBackButton onPress={() => router.back()} />,
+      }}
+    >
+      <Stack.Screen name="index" options={{ headerShown: false }} />
+      <Stack.Screen name="settings" options={{ headerShown: true, title: '设置' }} />
+      <Stack.Screen name="edit-profile" options={{ title: '编辑资料' }} />
+      <Stack.Screen name="account-security" options={{ title: '账号安全' }} />
+      <Stack.Screen name="my-posts" options={{ title: '我的帖子' }} />
+      <Stack.Screen name="bookmarks" options={{ title: '收藏' }} />
+      <Stack.Screen name="notification-settings" options={{ title: '通知设置' }} />
+      <Stack.Screen name="blocked-users" options={{ title: '黑名单' }} />
+    </Stack>
+  );
+}

app/(app)/(tabs)/profile/account-security.tsx

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+import { AccountSecurityScreen } from '../../../../src/screens/profile';
+
+export default function AccountSecurityRoute() {
+  return <AccountSecurityScreen />;
+}

app/(app)/(tabs)/profile/blocked-users.tsx

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+import { BlockedUsersScreen } from '../../../../src/screens/profile';
+
+export default function BlockedUsersRoute() {
+  return <BlockedUsersScreen />;
+}

app/(app)/(tabs)/profile/bookmarks.tsx

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+import { ProfileScreen } from '../../../../src/screens/profile';
+
+export default function BookmarksRoute() {
+  return <ProfileScreen />;
+}

app/(app)/(tabs)/profile/edit-profile.tsx

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+import { EditProfileScreen } from '../../../../src/screens/profile';
+
+export default function EditProfileRoute() {
+  return <EditProfileScreen />;
+}

app/(app)/(tabs)/profile/index.tsx

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+import { ProfileScreen } from '../../../../src/screens/profile';
+
+export default function ProfileRoute() {
+  return <ProfileScreen />;
+}

app/(app)/(tabs)/profile/my-posts.tsx

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+import { ProfileScreen } from '../../../../src/screens/profile';
+
+export default function MyPostsRoute() {
+  return <ProfileScreen />;
+}

app/(app)/(tabs)/profile/notification-settings.tsx

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+import { NotificationSettingsScreen } from '../../../../src/screens/profile';
+
+export default function NotificationSettingsRoute() {
+  return <NotificationSettingsScreen />;
+}

app/(app)/(tabs)/profile/settings.tsx

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+import { SettingsScreen } from '../../../../src/screens/profile';
+
+export default function SettingsRoute() {
+  return <SettingsScreen />;
+}

app/(app)/(tabs)/schedule/_layout.tsx

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+import { Stack } from 'expo-router';
+
+export default function ScheduleStackLayout() {
+  return (
+    <Stack screenOptions={{ headerShown: false }}>
+      <Stack.Screen name="index" />
+      <Stack.Screen
+        name="course"
+        options={{
+          headerShown: false,
+          presentation: 'transparentModal',
+          animation: 'fade',
+        }}
+      />
+    </Stack>
+  );
+}

app/(app)/(tabs)/schedule/course.tsx

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+import { CourseDetailScreen } from '../../../../src/screens/schedule';
+
+export default function CourseDetailRoute() {
+  return <CourseDetailScreen />;
+}

app/(app)/(tabs)/schedule/index.tsx

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+import { ScheduleScreen } from '../../../../src/screens/schedule';
+
+export default function ScheduleRoute() {
+  return <ScheduleScreen />;
+}