feat: 添加教练功能和更新用户界面

- 新增教练页面，用户可以与教练进行互动和咨询
- 更新首页，切换到教练 tab 并传递名称参数
- 优化个人信息页面，添加注销帐号和退出登录功能
- 更新隐私政策和用户协议的链接，确保用户在使用前同意相关条款
- 修改今日训练页面标题为“开始训练”，提升用户体验
- 删除不再使用的进度条组件，简化代码结构

hooks/useAuthGuard.ts

@@ -1,7 +1,11 @@
+import AsyncStorage from '@react-native-async-storage/async-storage';
 import { usePathname, useRouter } from 'expo-router';
 import { useCallback } from 'react';
+import { Alert } from 'react-native';
 
-import { useAppSelector } from '@/hooks/redux';
+import { useAppDispatch, useAppSelector } from '@/hooks/redux';
+import { api } from '@/services/api';
+import { logout as logoutAction } from '@/store/userSlice';
 
 type RedirectParams = Record<string, string | number | boolean | undefined>;
 
@@ -12,6 +16,7 @@ type EnsureOptions = {
 
 export function useAuthGuard() {
   const router = useRouter();
+  const dispatch = useAppDispatch();
   const currentPath = usePathname();
   const token = useAppSelector((s) => (s as any)?.user?.token as string | null);
   const isLoggedIn = !!token;
@@ -52,11 +57,93 @@ export function useAuthGuard() {
     [ensureLoggedIn]
   );
 
+  // 退出登录功能
+  const handleLogout = useCallback(async () => {
+    try {
+      // 调用 Redux action 清除本地状态和缓存
+      await dispatch(logoutAction()).unwrap();
+      
+      // 跳转到登录页面
+      router.replace('/auth/login');
+    } catch (error) {
+      console.error('退出登录失败:', error);
+      Alert.alert('错误', '退出登录失败，请稍后重试');
+    }
+  }, [dispatch, router]);
+
+  // 带确认对话框的退出登录
+  const confirmLogout = useCallback(() => {
+    Alert.alert(
+      '确认退出',
+      '确定要退出当前账号吗？',
+      [
+        {
+          text: '取消',
+          style: 'cancel',
+        },
+        {
+          text: '确定',
+          style: 'default',
+          onPress: handleLogout,
+        },
+      ]
+    );
+  }, [handleLogout]);
+
+  // 注销账号功能
+  const handleDeleteAccount = useCallback(async () => {
+    try {
+      // 调用注销账号API
+      await api.delete('/api/users/delete-account');
+      
+      // 清除额外的本地数据
+      await AsyncStorage.multiRemove(['@user_personal_info', '@onboarding_completed']);
+      
+      // 执行退出登录逻辑
+      await dispatch(logoutAction()).unwrap();
+      
+      Alert.alert('账号已注销', '您的账号已成功注销', [
+        {
+          text: '确定',
+          onPress: () => router.replace('/auth/login'),
+        },
+      ]);
+    } catch (error: any) {
+      console.error('注销账号失败:', error);
+      const message = error?.message || '注销失败，请稍后重试';
+      Alert.alert('注销失败', message);
+    }
+  }, [dispatch, router]);
+
+  // 带确认对话框的注销账号
+  const confirmDeleteAccount = useCallback(() => {
+    Alert.alert(
+      '确认注销账号',
+      '此操作不可恢复，将删除您的账号及相关数据。确定继续吗？',
+      [
+        {
+          text: '取消',
+          style: 'cancel',
+        },
+        {
+          text: '确认注销',
+          style: 'destructive',
+          onPress: handleDeleteAccount,
+        },
+      ],
+      { cancelable: true }
+    );
+  }, [handleDeleteAccount]);
+
   return {
     isLoggedIn,
     ensureLoggedIn,
     pushIfAuthedElseLogin,
     guardHandler,
+    handleLogout,
+    confirmLogout,
+    handleDeleteAccount,
+    confirmDeleteAccount,
   } as const;
 }