feat: 添加饮水设置页面，支持每日饮水目标和快速添加默认值的配置

app/_layout.tsx

@@ -8,11 +8,11 @@ import 'react-native-reanimated';
 import PrivacyConsentModal from '@/components/PrivacyConsentModal';
 import { useAppDispatch, useAppSelector } from '@/hooks/redux';
 import { clearAiCoachSessionCache } from '@/services/aiCoachSession';
+import { backgroundTaskManager } from '@/services/backgroundTaskManager';
 import { notificationService } from '@/services/notifications';
 import { store } from '@/store';
 import { rehydrateUser, setPrivacyAgreed } from '@/store/userSlice';
 import { MoodNotificationHelpers, NutritionNotificationHelpers } from '@/utils/notificationHelpers';
-import { backgroundTaskManager } from '@/services/backgroundTaskManager';
 import React from 'react';
 import RNExitApp from 'react-native-exit-app';
 
@@ -140,6 +140,7 @@ export default function RootLayout() {
                 <Stack.Screen name="legal/user-agreement" options={{ headerShown: true, title: '用户协议' }} />
                 <Stack.Screen name="legal/privacy-policy" options={{ headerShown: true, title: '隐私政策' }} />
                 <Stack.Screen name="article/[id]" options={{ headerShown: false }} />
+                <Stack.Screen name="water-settings" options={{ headerShown: false }} />
                 <Stack.Screen name="+not-found" />
               </Stack>
               <StatusBar style="dark" />