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.

src/screens/auth/RegisterScreen.tsx

@@ -22,25 +22,23 @@ import {
   StatusBar,
 } from 'react-native';
 import { SafeAreaView } from 'react-native-safe-area-context';
-import { useNavigation } from '@react-navigation/native';
-import { NativeStackNavigationProp } from '@react-navigation/native-stack';
+import { useRouter } from 'expo-router';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
 import { LinearGradient } from 'expo-linear-gradient';
 import { colors, spacing, borderRadius, shadows, fontSizes } from '../../theme';
 import { authService, resolveAuthApiError } from '../../services/authService';
 import { useAuthStore } from '../../stores';
-import { RootStackParamList } from '../../navigation/types';
+import * as hrefs from '../../navigation/hrefs';
 import { useResponsive, useResponsiveValue } from '../../hooks';
 import { showPrompt } from '../../services/promptService';
 
-type RegisterNavigationProp = NativeStackNavigationProp<RootStackParamList, 'Auth'>;
-
 // 分栏布局断点
 const SPLIT_BREAKPOINT = 768;
 
 export const RegisterScreen: React.FC = () => {
-  const navigation = useNavigation<RegisterNavigationProp>();
+  const router = useRouter();
   const register = useAuthStore((state) => state.register);
+  const isAuthenticated = useAuthStore((state) => state.isAuthenticated);
   
   // 响应式布局
   const { isLandscape, width } = useResponsive();
@@ -48,6 +46,12 @@ export const RegisterScreen: React.FC = () => {
   // 是否使用分栏布局
   const isSplitLayout = width >= SPLIT_BREAKPOINT;
 
+  useEffect(() => {
+    if (isAuthenticated) {
+      router.replace(hrefs.hrefHome());
+    }
+  }, [isAuthenticated, router]);
+
   const [username, setUsername] = useState('');
   const [nickname, setNickname] = useState('');
   const [email, setEmail] = useState('');
@@ -238,7 +242,7 @@ export const RegisterScreen: React.FC = () => {
 
   // 跳转到登录页
   const handleGoToLogin = () => {
-    navigation.navigate('Login' as any);
+    router.push(hrefs.hrefAuthLogin());
   };
 
   // 渲染左侧面板（Logo和品牌信息）- 优化大屏布局