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/create/CreatePostScreen.tsx

@@ -21,17 +21,17 @@ import {
   Image,
 } from 'react-native';
 import { SafeAreaView } from 'react-native-safe-area-context';
-import { useNavigation, useRoute, RouteProp } from '@react-navigation/native';
+import { useRouter, useLocalSearchParams, useNavigation } from 'expo-router';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
 import * as ImagePicker from 'expo-image-picker';
 import { colors, spacing, fontSizes, borderRadius, shadows } from '../../theme';
-import { Text, Button, ResponsiveContainer } from '../../components/common';
+import { Text, Button, ResponsiveContainer, AppBackButton } from '../../components/common';
 import { postService, showPrompt, voteService } from '../../services';
 import { ApiError } from '../../services/api';
 import { uploadService } from '../../services/uploadService';
 import VoteEditor from '../../components/business/VoteEditor';
 import { useResponsive, useResponsiveValue } from '../../hooks';
-import { RootStackParamList } from '../../navigation/types';
+import * as hrefs from '../../navigation/hrefs';
 
 // Props 接口
 interface CreatePostScreenProps {
@@ -80,10 +80,11 @@ const getPublishErrorMessage = (error: unknown): string => {
 
 export const CreatePostScreen: React.FC<CreatePostScreenProps> = (props) => {
   const { onClose } = props;
+  const router = useRouter();
   const navigation = useNavigation();
-  const route = useRoute<RouteProp<RootStackParamList, 'CreatePost'>>();
-  const isEditMode = route.params?.mode === 'edit' && !!route.params?.postId;
-  const editPostID = route.params?.postId || '';
+  const { mode, postId: postIdParam } = useLocalSearchParams<{ mode?: string; postId?: string }>();
+  const isEditMode = mode === 'edit' && !!postIdParam;
+  const editPostID = postIdParam || '';
   
   // 响应式布局
   const { isWideScreen, width } = useResponsive();
@@ -135,12 +136,11 @@ export const CreatePostScreen: React.FC<CreatePostScreenProps> = (props) => {
 
   React.useLayoutEffect(() => {
     navigation.setOptions({
+      headerShown: true,
       title: isEditMode ? '编辑帖子' : '发布帖子',
       // 当作为 Modal 使用时，显示关闭按钮
       headerLeft: onClose ? () => (
-        <TouchableOpacity onPress={onClose} style={{ padding: 8 }}>
-          <MaterialCommunityIcons name="close" size={24} color={colors.text.primary} />
-        </TouchableOpacity>
+        <AppBackButton onPress={onClose} icon="close" />
       ) : undefined,
     });
   }, [navigation, isEditMode, onClose]);
@@ -156,7 +156,7 @@ export const CreatePostScreen: React.FC<CreatePostScreenProps> = (props) => {
         const existingPost = await postService.getPost(editPostID);
         if (!existingPost) {
           Alert.alert('提示', '帖子不存在或已被删除');
-          navigation.goBack();
+          router.back();
           return;
         }
         setTitle(existingPost.title || '');
@@ -165,14 +165,14 @@ export const CreatePostScreen: React.FC<CreatePostScreenProps> = (props) => {
       } catch (error) {
         console.error('加载待编辑帖子失败:', error);
         Alert.alert('错误', '加载帖子失败，请稍后重试');
-        navigation.goBack();
+        router.back();
       } finally {
         setLoadingPost(false);
       }
     };
 
     loadPostForEdit();
-  }, [isEditMode, editPostID, navigation]);
+  }, [isEditMode, editPostID, router]);
 
   // 选择图片
   const handlePickImage = async () => {
@@ -381,10 +381,7 @@ export const CreatePostScreen: React.FC<CreatePostScreenProps> = (props) => {
           message: '投票帖已提交，内容审核中，稍后展示',
           duration: 2600,
         });
-        navigation.reset({
-          index: 0,
-          routes: [{ name: 'Main' }],
-        });
+        router.replace(hrefs.hrefHome());
       } else {
         if (isEditMode && editPostID) {
           const updated = await postService.updatePost(editPostID, {
@@ -401,10 +398,7 @@ export const CreatePostScreen: React.FC<CreatePostScreenProps> = (props) => {
             message: '帖子内容已更新',
             duration: 2200,
           });
-          navigation.reset({
-            index: 0,
-            routes: [{ name: 'Main' }],
-          });
+          router.replace(hrefs.hrefHome());
         } else {
           // 创建普通帖子
           await postService.createPost({
@@ -418,10 +412,7 @@ export const CreatePostScreen: React.FC<CreatePostScreenProps> = (props) => {
             message: '帖子已提交，内容审核中，稍后展示',
             duration: 2600,
           });
-          navigation.reset({
-            index: 0,
-            routes: [{ name: 'Main' }],
-          });
+          router.replace(hrefs.hrefHome());
         }
       }
     } catch (error) {