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/message/CreateGroupScreen.tsx

@@ -16,8 +16,7 @@ import {
   Image,
 } 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 * as ImagePicker from 'expo-image-picker';
 import { colors, spacing, fontSizes, borderRadius, shadows } from '../../theme';
@@ -25,13 +24,10 @@ import { groupService } from '../../services/groupService';
 import { uploadService } from '../../services/uploadService';
 import { Avatar, Text, Button, Loading } from '../../components/common';
 import { User } from '../../types';
-import { RootStackParamList } from '../../navigation/types';
 import MutualFollowSelectorModal from './components/MutualFollowSelectorModal';
 
-type NavigationProp = NativeStackNavigationProp<RootStackParamList>;
-
 const CreateGroupScreen: React.FC = () => {
-  const navigation = useNavigation<NavigationProp>();
+  const router = useRouter();
 
   // 表单状态
   const [groupName, setGroupName] = useState('');
@@ -138,7 +134,7 @@ const CreateGroupScreen: React.FC = () => {
       Alert.alert('成功', '群组创建成功', [
         {
           text: '确定',
-          onPress: () => navigation.goBack(),
+          onPress: () => router.back(),
         },
       ]);
     } catch (error: any) {