feat(i18n): 增强生理周期模块的国际化支持，添加多语言格式和翻译

components/menstrual-cycle/DayCell.tsx

@@ -1,10 +1,12 @@
 import { Colors } from '@/constants/Colors';
 import React from 'react';
+import { useTranslation } from 'react-i18next';
 import { StyleSheet, Text, TouchableOpacity, View } from 'react-native';
 import { STATUS_COLORS } from './constants';
 import { DayCellProps } from './types';
 
 export const DayCell: React.FC<DayCellProps> = ({ cell, isSelected, onPress }) => {
+  const { t } = useTranslation();
   const status = cell.info?.status;
   const colors = status ? STATUS_COLORS[status] : undefined;
 
@@ -32,7 +34,7 @@ export const DayCell: React.FC<DayCellProps> = ({ cell, isSelected, onPress }) =
           {cell.label}
         </Text>
       </View>
-      {cell.isToday && <Text style={styles.todayText}>今天</Text>}
+      {cell.isToday && <Text style={styles.todayText}>{t('menstrual.today')}</Text>}
     </TouchableOpacity>
   );
 };