feat(i18n): 实现应用国际化支持，添加中英文翻译

- 为所有UI组件添加国际化支持，替换硬编码文本
- 新增useI18n钩子函数统一管理翻译
- 完善中英文翻译资源，覆盖统计、用药、通知设置等模块
- 优化Tab布局使用翻译键值替代静态文本
- 更新药品管理、个人资料编辑等页面的多语言支持

components/medication/MedicationCard.tsx

@@ -1,5 +1,6 @@
 import { ThemedText } from '@/components/ThemedText';
 import { useAppDispatch } from '@/hooks/redux';
+import { useI18n } from '@/hooks/useI18n';
 import { takeMedicationAction } from '@/store/medicationsSlice';
 import type { MedicationDisplayItem } from '@/types/medication';
 import { Ionicons } from '@expo/vector-icons';
@@ -19,6 +20,7 @@ export type MedicationCardProps = {
 
 export function MedicationCard({ medication, colors, selectedDate, onOpenDetails, onCelebrate }: MedicationCardProps) {
   const dispatch = useAppDispatch();
+  const { t } = useI18n();
   const [isSubmitting, setIsSubmitting] = useState(false);
   const [imageError, setImageError] = useState(false);
   
@@ -43,11 +45,11 @@ export function MedicationCard({ medication, colors, selectedDate, onOpenDetails
     if (timeDiffMinutes > 60) {
       // 显示二次确认弹窗
       Alert.alert(
-        '尚未到服药时间',
-        `该用药计划在 ${medication.scheduledTime}，现在还早于1小时以上。\n\n是否确认已服用此药物？`,
+        t('medications.card.earlyTakeAlert.title'),
+        t('medications.card.earlyTakeAlert.message', { time: medication.scheduledTime }),
         [
           {
-            text: '取消',
+            text: t('medications.card.earlyTakeAlert.cancel'),
             style: 'cancel',
             onPress: () => {
               // 用户取消，不执行任何操作
@@ -55,7 +57,7 @@ export function MedicationCard({ medication, colors, selectedDate, onOpenDetails
             },
           },
           {
-            text: '确认已服用',
+            text: t('medications.card.earlyTakeAlert.confirm'),
             style: 'default',
             onPress: () => {
               // 用户确认，执行服药逻辑
@@ -89,9 +91,9 @@ export function MedicationCard({ medication, colors, selectedDate, onOpenDetails
     } catch (error) {
       console.error('[MEDICATION_CARD] 服药操作失败', error);
       Alert.alert(
-        '操作失败',
-        error instanceof Error ? error.message : '记录服药时发生错误，请稍后重试',
-        [{ text: '确定' }]
+        t('medications.card.takeError.title'),
+        error instanceof Error ? error.message : t('medications.card.takeError.message'),
+        [{ text: t('medications.card.takeError.confirm') }]
       );
     } finally {
       setIsSubmitting(false);
@@ -102,7 +104,7 @@ export function MedicationCard({ medication, colors, selectedDate, onOpenDetails
     if (medication.status === 'missed') {
       return (
         <View style={[styles.statusChip, styles.statusChipMissed]}>
-          <ThemedText style={styles.statusChipText}>已错过</ThemedText>
+          <ThemedText style={styles.statusChipText}>{t('medications.card.status.missed')}</ThemedText>
         </View>
       );
     }
@@ -112,7 +114,7 @@ export function MedicationCard({ medication, colors, selectedDate, onOpenDetails
         return (
           <View style={[styles.statusChip, styles.statusChipUpcoming]}>
             <Ionicons name="time-outline" size={14} color="#fff" />
-            <ThemedText style={styles.statusChipText}>到服药时间</ThemedText>
+            <ThemedText style={styles.statusChipText}>{t('medications.card.status.timeToTake')}</ThemedText>
           </View>
         );
       }
@@ -125,7 +127,7 @@ export function MedicationCard({ medication, colors, selectedDate, onOpenDetails
       return (
         <View style={[styles.statusChip, styles.statusChipUpcoming]}>
           <Ionicons name="time-outline" size={14} color="#fff" />
-          <ThemedText style={styles.statusChipText}>剩余 {formatted}</ThemedText>
+          <ThemedText style={styles.statusChipText}>{t('medications.card.status.remaining', { time: formatted })}</ThemedText>
         </View>
       );
     }
@@ -138,7 +140,7 @@ export function MedicationCard({ medication, colors, selectedDate, onOpenDetails
       return (
         <View style={[styles.actionButton, styles.actionButtonTaken]}>
           <Ionicons name="checkmark-circle" size={18} color="#fff" />
-          <ThemedText style={styles.actionButtonText}>已服用</ThemedText>
+          <ThemedText style={styles.actionButtonText}>{t('medications.card.action.taken')}</ThemedText>
         </View>
       );
     }
@@ -158,13 +160,13 @@ export function MedicationCard({ medication, colors, selectedDate, onOpenDetails
             isInteractive={!isSubmitting}
           >
             <ThemedText style={styles.actionButtonText}>
-              {isSubmitting ? '提交中...' : '立即服用'}
+              {isSubmitting ? t('medications.card.action.submitting') : t('medications.card.action.takeNow')}
             </ThemedText>
           </GlassView>
         ) : (
           <View style={[styles.actionButton, styles.actionButtonUpcoming, styles.fallbackActionButton]}>
             <ThemedText style={styles.actionButtonText}>
-              {isSubmitting ? '提交中...' : '立即服用'}
+              {isSubmitting ? t('medications.card.action.submitting') : t('medications.card.action.takeNow')}
             </ThemedText>
           </View>
         )}