feat(auth): 添加401未授权统一处理机制

- 在API服务层实现401状态码的统一拦截和处理
- 添加防抖机制，避免短时间内重复处理401错误
- 支持应用层注册自定义的未授权处理器
- 在应用启动时注册401处理器，自动清除登录状态并跳转到登录页
- 同时处理普通请求和流式请求的401响应

app/_layout.tsx

@@ -1,7 +1,7 @@
 import '@/i18n';
 import { DefaultTheme, ThemeProvider } from '@react-navigation/native';
 import { useFonts } from 'expo-font';
-import { Stack } from 'expo-router';
+import { Stack, useRouter } from 'expo-router';
 import { StatusBar } from 'expo-status-bar';
 import { GestureHandlerRootView } from 'react-native-gesture-handler';
 import 'react-native-reanimated';
@@ -19,7 +19,7 @@ import { WaterRecordSource } from '@/services/waterRecords';
 import { workoutMonitorService } from '@/services/workoutMonitor';
 import { store } from '@/store';
 import { hydrateActiveSchedule, selectActiveFastingSchedule } from '@/store/fastingSlice';
-import { fetchMyProfile, setPrivacyAgreed } from '@/store/userSlice';
+import { fetchMyProfile, logout, setPrivacyAgreed } from '@/store/userSlice';
 import { createWaterRecordAction } from '@/store/waterSlice';
 import { loadActiveFastingSchedule } from '@/utils/fasting';
 import { initializeHealthPermissions } from '@/utils/health';
@@ -31,7 +31,7 @@ import { DialogProvider } from '@/components/ui/DialogProvider';
 import { MembershipModalProvider } from '@/contexts/MembershipModalContext';
 import { ToastProvider } from '@/contexts/ToastContext';
 import { useAuthGuard } from '@/hooks/useAuthGuard';
-import { STORAGE_KEYS } from '@/services/api';
+import { STORAGE_KEYS, setUnauthorizedHandler } from '@/services/api';
 import { BackgroundTaskManager } from '@/services/backgroundTaskManagerV2';
 import { fetchChallenges } from '@/store/challengesSlice';
 import AsyncStorage from '@/utils/kvStore';
@@ -52,6 +52,7 @@ if (__DEV__) {
 
 function Bootstrapper({ children }: { children: React.ReactNode }) {
   const dispatch = useAppDispatch();
+  const router = useRouter();
   const { profile, onboardingCompleted } = useAppSelector((state) => state.user);
   const activeFastingSchedule = useAppSelector(selectActiveFastingSchedule);
   const [showPrivacyModal, setShowPrivacyModal] = React.useState(false);
@@ -62,6 +63,28 @@ function Bootstrapper({ children }: { children: React.ReactNode }) {
   // 初始化快捷动作处理
   useQuickActions();
 
+  // 注册401未授权处理器（应用启动时执行一次）
+  React.useEffect(() => {
+    const handle401 = async () => {
+      try {
+        logger.info('[401处理] 开始处理登录过期');
+        
+        // 清除Redux状态
+        await dispatch(logout());
+        
+        // 跳转到登录页
+        router.push('/auth/login');
+        
+        logger.info('[401处理] 登录过期处理完成');
+      } catch (error) {
+        logger.error('[401处理] 处理失败:', error);
+      }
+    };
+
+    setUnauthorizedHandler(handle401);
+    logger.info('[401处理器] 已注册到API服务');
+  }, [dispatch, router]);
+
   React.useEffect(() => {
     if (fastingHydrationRequestedRef.current) return;
     if (activeFastingSchedule) {