feat(medications): 添加AI智能识别药品功能和有效期管理

- 新增AI药品识别流程，支持多角度拍摄和实时进度显示
- 添加药品有效期字段，支持在添加和编辑药品时设置有效期
- 新增MedicationAddOptionsSheet选择录入方式（AI识别/手动录入）
- 新增ai-camera和ai-progress两个独立页面处理AI识别流程
- 新增ExpiryDatePickerModal和MedicationPhotoGuideModal组件
- 移除本地通知系统，迁移到服务端推送通知
- 添加medicationNotificationCleanup服务清理旧的本地通知
- 更新药品详情页支持AI草稿模式和有效期显示
- 优化药品表单，支持有效期选择和AI识别结果确认
- 更新i18n资源，添加有效期相关翻译

BREAKING CHANGE: 药品通知系统从本地通知迁移到服务端推送，旧版本的本地通知将被清理

app/medications/add-medication.tsx

@@ -7,7 +7,6 @@ import { useAppDispatch } from '@/hooks/redux';
 import { useAuthGuard } from '@/hooks/useAuthGuard';
 import { useColorScheme } from '@/hooks/useColorScheme';
 import { useCosUpload } from '@/hooks/useCosUpload';
-import { medicationNotificationService } from '@/services/medicationNotifications';
 import { createMedicationAction, fetchMedicationRecords, fetchMedications } from '@/store/medicationsSlice';
 import type { MedicationForm, RepeatPattern } from '@/types/medication';
 import { Ionicons, MaterialCommunityIcons } from '@expo/vector-icons';
@@ -151,10 +150,13 @@ export default function AddMedicationScreen() {
   const [timesPickerValue, setTimesPickerValue] = useState(1);
   const [startDate, setStartDate] = useState<Date>(new Date());
   const [endDate, setEndDate] = useState<Date | null>(null);
+  const [expiryDate, setExpiryDate] = useState<Date | null>(null);
   const [datePickerVisible, setDatePickerVisible] = useState(false);
   const [datePickerValue, setDatePickerValue] = useState<Date>(new Date());
   const [endDatePickerVisible, setEndDatePickerVisible] = useState(false);
   const [endDatePickerValue, setEndDatePickerValue] = useState<Date>(new Date());
+  const [expiryDatePickerVisible, setExpiryDatePickerVisible] = useState(false);
+  const [expiryDatePickerValue, setExpiryDatePickerValue] = useState<Date>(new Date());
   const [datePickerMode, setDatePickerMode] = useState<'start' | 'end'>('start');
   const [medicationTimes, setMedicationTimes] = useState<string[]>([DEFAULT_TIME_PRESETS[0]]);
   const [timePickerVisible, setTimePickerVisible] = useState(false);
@@ -319,6 +321,7 @@ export default function AddMedicationScreen() {
         medicationTimes: medicationTimes,
         startDate: dayjs(startDate).startOf('day').toISOString(), // ISO 8601 格式
         endDate: endDate ? dayjs(endDate).endOf('day').toISOString() : undefined, // 如果有结束日期，设置为当天结束时间
+        expiryDate: expiryDate ? dayjs(expiryDate).endOf('day').toISOString() : undefined, // 如果有有效期，设置为当天结束时间
         repeatPattern: 'daily' as RepeatPattern,
         note: note.trim() || undefined,
       };
@@ -333,16 +336,6 @@ export default function AddMedicationScreen() {
       const today = dayjs().format('YYYY-MM-DD');
       await dispatch(fetchMedicationRecords({ date: today }));
       
-      // 重新安排药品通知
-      try {
-        // 获取最新的药品列表
-        const medications = await dispatch(fetchMedications({ isActive: true })).unwrap();
-        await medicationNotificationService.rescheduleAllMedicationNotifications(medications);
-      } catch (error) {
-        console.error('[MEDICATION] 安排药品通知失败:', error);
-        // 不影响添加药品的成功流程，只记录错误
-      }
-      
       // 成功提示
       Alert.alert(
         '添加成功',
@@ -531,6 +524,11 @@ export default function AddMedicationScreen() {
     setEndDatePickerVisible(true);
   }, [endDate]);
 
+  const openExpiryDatePicker = useCallback(() => {
+    setExpiryDatePickerValue(expiryDate || new Date());
+    setExpiryDatePickerVisible(true);
+  }, [expiryDate]);
+
   const confirmStartDate = useCallback((date: Date) => {
     // 验证开始日期不能早于今天
     const today = new Date();
@@ -563,6 +561,22 @@ export default function AddMedicationScreen() {
     setEndDatePickerVisible(false);
   }, [startDate]);
 
+  const confirmExpiryDate = useCallback((date: Date) => {
+    // 验证有效期不能早于今天
+    const today = new Date();
+    today.setHours(0, 0, 0, 0);
+    const selectedDate = new Date(date);
+    selectedDate.setHours(0, 0, 0, 0);
+    
+    if (selectedDate < today) {
+      Alert.alert('日期无效', '有效期不能早于今天');
+      return;
+    }
+    
+    setExpiryDate(date);
+    setExpiryDatePickerVisible(false);
+  }, []);
+
   const openTimePicker = useCallback(
     (index?: number) => {
       try {
@@ -872,6 +886,32 @@ export default function AddMedicationScreen() {
                 </TouchableOpacity>
               </View>
             </View>
+
+            <View style={styles.inputGroup}>
+              <View style={styles.periodHeader}>
+                <ThemedText style={[styles.groupLabel, { color: colors.textSecondary }]}>药品有效期</ThemedText>
+              </View>
+              <TouchableOpacity
+                activeOpacity={0.85}
+                style={[
+                  styles.dateRow,
+                  {
+                    borderColor: softBorderColor,
+                    backgroundColor: colors.surface,
+                  },
+                ]}
+                onPress={openExpiryDatePicker}
+              >
+                <View style={styles.dateLeft}>
+                  <Ionicons name="time-outline" size={16} color={colors.textSecondary} />
+                  <ThemedText style={[styles.dateLabel, { color: colors.textMuted }]}>有效期至</ThemedText>
+                  <ThemedText style={[styles.dateValue, { color: colors.text }]}>
+                    {expiryDate ? dayjs(expiryDate).format('YYYY/MM/DD') : '未设置'}
+                  </ThemedText>
+                </View>
+                <Ionicons name="chevron-forward" size={16} color={colors.textSecondary} />
+              </TouchableOpacity>
+            </View>
           </View>
         );
       case 3:
@@ -1166,6 +1206,51 @@ export default function AddMedicationScreen() {
         </View>
       </Modal>
 
+      <Modal
+        visible={expiryDatePickerVisible}
+        transparent
+        animationType="fade"
+        onRequestClose={() => setExpiryDatePickerVisible(false)}
+      >
+        <Pressable style={styles.pickerBackdrop} onPress={() => setExpiryDatePickerVisible(false)} />
+        <View style={[styles.pickerSheet, { backgroundColor: colors.surface }]}
+        >
+          <ThemedText style={[styles.modalTitle, { color: colors.text }]}>选择药品有效期</ThemedText>
+          <DateTimePicker
+            value={expiryDatePickerValue}
+            mode="date"
+            display={Platform.OS === 'ios' ? 'inline' : 'calendar'}
+            onChange={(event, date) => {
+              if (Platform.OS === 'ios') {
+                if (date) setExpiryDatePickerValue(date);
+              } else {
+                if (event.type === 'set' && date) {
+                  confirmExpiryDate(date);
+                } else {
+                  setExpiryDatePickerVisible(false);
+                }
+              }
+            }}
+          />
+          {Platform.OS === 'ios' && (
+            <View style={styles.modalActions}>
+              <Pressable
+                onPress={() => setExpiryDatePickerVisible(false)}
+                style={[styles.modalBtn, { borderColor: softBorderColor }]}
+              >
+                <ThemedText style={[styles.modalBtnText, { color: colors.textSecondary }]}>取消</ThemedText>
+              </Pressable>
+              <Pressable
+                onPress={() => confirmExpiryDate(expiryDatePickerValue)}
+                style={[styles.modalBtn, styles.modalBtnPrimary, { backgroundColor: colors.primary }]}
+              >
+                <ThemedText style={[styles.modalBtnText, { color: colors.onPrimary }]}>确定</ThemedText>
+              </Pressable>
+            </View>
+          )}
+        </View>
+      </Modal>
+
       <Modal
         visible={endDatePickerVisible}
         transparent