feat(medical): 添加医疗免责声明和参考文献功能

- 在用药模块首次添加时显示医疗免责声明弹窗
- 新增断食参考文献页面，展示权威医学机构来源
- 在个人中心添加WHO医学来源入口
- 使用本地存储记录用户已读免责声明状态
- 支持Liquid Glass毛玻璃效果和降级方案
- 新增中英文国际化翻译支持

app/(tabs)/medications.tsx

@@ -3,12 +3,14 @@ import { DateSelector } from '@/components/DateSelector';
 import { MedicationCard } from '@/components/medication/MedicationCard';
 import { ThemedText } from '@/components/ThemedText';
 import { IconSymbol } from '@/components/ui/IconSymbol';
+import { MedicalDisclaimerSheet } from '@/components/ui/MedicalDisclaimerSheet';
 import { Colors } from '@/constants/Colors';
 import { useAppDispatch, useAppSelector } from '@/hooks/redux';
 import { useColorScheme } from '@/hooks/useColorScheme';
 import { medicationNotificationService } from '@/services/medicationNotifications';
 import { fetchMedicationRecords, fetchMedications, selectMedicationDisplayItemsByDate } from '@/store/medicationsSlice';
 import { DEFAULT_MEMBER_NAME } from '@/store/userSlice';
+import { getItemSync, setItemSync } from '@/utils/kvStore';
 import { convertMedicationDataToWidget, refreshWidget, syncMedicationDataToWidget } from '@/utils/widgetDataSync';
 import { useFocusEffect } from '@react-navigation/native';
 import dayjs, { Dayjs } from 'dayjs';
@@ -29,6 +31,9 @@ import { useSafeAreaInsets } from 'react-native-safe-area-context';
 
 dayjs.locale('zh-cn');
 
+// 本地存储键名：医疗免责声明已读状态
+const MEDICAL_DISCLAIMER_READ_KEY = 'medical_disclaimer_read';
+
 type MedicationFilter = 'all' | 'taken' | 'missed';
 
 type ThemeColors = (typeof Colors)[keyof typeof Colors];
@@ -46,15 +51,37 @@ export default function MedicationsScreen() {
   const celebrationRef = useRef<CelebrationAnimationRef>(null);
   const celebrationTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
   const [isCelebrationVisible, setIsCelebrationVisible] = useState(false);
+  const [disclaimerVisible, setDisclaimerVisible] = useState(false);
 
   // 从 Redux 获取数据
   const selectedKey = selectedDate.format('YYYY-MM-DD');
   const medicationsForDay = useAppSelector((state) => selectMedicationDisplayItemsByDate(selectedKey)(state));
 
   const handleOpenAddMedication = useCallback(() => {
+    // 检查是否已经读过免责声明
+    const hasRead = getItemSync(MEDICAL_DISCLAIMER_READ_KEY);
+    
+    if (hasRead === 'true') {
+      // 已读过，直接跳转
+      router.push('/medications/add-medication');
+    } else {
+      // 未读过，显示医疗免责声明弹窗
+      setDisclaimerVisible(true);
+    }
+  }, []);
+
+  const handleDisclaimerConfirm = useCallback(() => {
+    // 用户同意免责声明后，记录已读状态，关闭弹窗并跳转到添加页面
+    setItemSync(MEDICAL_DISCLAIMER_READ_KEY, 'true');
+    setDisclaimerVisible(false);
     router.push('/medications/add-medication');
   }, []);
 
+  const handleDisclaimerClose = useCallback(() => {
+    // 用户不接受免责声明，只关闭弹窗，不跳转，不记录已读状态
+    setDisclaimerVisible(false);
+  }, []);
+
   const handleOpenMedicationManagement = useCallback(() => {
     router.push('/medications/manage-medications');
   }, []);
@@ -328,6 +355,13 @@ export default function MedicationsScreen() {
           </View>
         )}
       </ScrollView>
+
+      {/* 医疗免责声明弹窗 */}
+      <MedicalDisclaimerSheet
+        visible={disclaimerVisible}
+        onClose={handleDisclaimerClose}
+        onConfirm={handleDisclaimerConfirm}
+      />
     </View>
   );
 }