feat(onboarding): 添加新用户引导流程

实现了完整的应用引导功能，包括：
- 新增引导页面UI，包含健康数据追踪、轻断食计划和健康挑战三个介绍页面
- 添加引导状态持久化存储，使用AsyncStorage管理用户完成状态
- 修改应用启动逻辑，根据引导状态决定跳转到主页或引导页
- 在开发者选项中添加重置引导状态功能，方便测试
- 更新路由配置和存储键常量，统一管理引导相关配置

app/developer.tsx

@@ -1,14 +1,26 @@
 import { ROUTES } from '@/constants/Routes';
+import { STORAGE_KEYS } from '@/services/api';
+import AsyncStorage from '@/utils/kvStore';
+import { Ionicons } from '@expo/vector-icons';
 import { useRouter } from 'expo-router';
 import React from 'react';
-import { ScrollView, StyleSheet, Text, TouchableOpacity, View } from 'react-native';
+import { Alert, ScrollView, StyleSheet, Text, TouchableOpacity, View } from 'react-native';
 import { useSafeAreaInsets } from 'react-native-safe-area-context';
-import { Ionicons } from '@expo/vector-icons';
 
 export default function DeveloperScreen() {
   const router = useRouter();
   const insets = useSafeAreaInsets();
 
+  const resetOnboardingStatus = async () => {
+    try {
+      await AsyncStorage.removeItem(STORAGE_KEYS.onboardingCompleted);
+      Alert.alert('成功', '引导状态已重置，下次启动应用将重新显示引导页面');
+    } catch (error) {
+      console.error('重置引导状态失败:', error);
+      Alert.alert('错误', '重置引导状态失败，请重试');
+    }
+  };
+
   const developerItems = [
     {
       title: '日志',
@@ -16,6 +28,12 @@ export default function DeveloperScreen() {
       icon: 'document-text-outline',
       onPress: () => router.push(ROUTES.DEVELOPER_LOGS),
     },
+    {
+      title: '重置引导状态',
+      subtitle: '清除 onboarding 缓存，下次启动将重新显示引导页面',
+      icon: 'refresh-outline',
+      onPress: resetOnboardingStatus,
+    },
   ];
 
   return (