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

app/(tabs)/_layout.tsx

@@ -3,6 +3,7 @@ import { GlassContainer, GlassView, isLiquidGlassAvailable } from 'expo-glass-ef
 import * as Haptics from 'expo-haptics';
 import { Tabs, usePathname } from 'expo-router';
 import { Icon, Label, NativeTabs } from 'expo-router/unstable-native-tabs';
+import { useTranslation } from 'react-i18next';
 
 import React from 'react';
 import { Text, TouchableOpacity, View, ViewStyle } from 'react-native';
@@ -16,18 +17,19 @@ import { useColorScheme } from '@/hooks/useColorScheme';
 // Tab configuration
 type TabConfig = {
   icon: string;
-  title: string;
+  titleKey: string;
 };
 
 const TAB_CONFIGS: Record<string, TabConfig> = {
-  statistics: { icon: 'chart.pie.fill', title: '健康' },
-  medications: { icon: 'pills.fill', title: '用药' },
-  fasting: { icon: 'timer', title: '断食' },
-  challenges: { icon: 'trophy.fill', title: '挑战' },
-  personal: { icon: 'person.fill', title: '个人' },
+  statistics: { icon: 'chart.pie.fill', titleKey: 'statistics.tabs.health' },
+  medications: { icon: 'pills.fill', titleKey: 'statistics.tabs.medications' },
+  fasting: { icon: 'timer', titleKey: 'statistics.tabs.fasting' },
+  challenges: { icon: 'trophy.fill', titleKey: 'statistics.tabs.challenges' },
+  personal: { icon: 'person.fill', titleKey: 'statistics.tabs.personal' },
 };
 
 export default function TabLayout() {
+  const { t } = useTranslation();
   const theme = (useColorScheme() ?? 'light') as 'light' | 'dark';
   const colorTokens = Colors[theme];
   const pathname = usePathname();
@@ -96,7 +98,7 @@ export default function TabLayout() {
               }}
               numberOfLines={1}
             >
-              {tabConfig.title}
+              {t(tabConfig.titleKey)}
             </Text>
           )}
         </View>
@@ -175,24 +177,24 @@ export default function TabLayout() {
   if (glassEffectAvailable) {
     return <NativeTabs>
       <NativeTabs.Trigger name="statistics">
-        <Label>健康</Label>
+        <Label>{t('statistics.tabs.health')}</Label>
         <Icon sf="chart.pie.fill" drawable="custom_android_drawable" />
       </NativeTabs.Trigger>
       <NativeTabs.Trigger name="medications">
         <Icon sf="pills.fill" drawable="custom_android_drawable" />
-        <Label>用药</Label>
+        <Label>{t('statistics.tabs.medications')}</Label>
       </NativeTabs.Trigger>
       <NativeTabs.Trigger name="fasting">
         <Icon sf="timer" drawable="custom_android_drawable" />
-        <Label>断食</Label>
+        <Label>{t('statistics.tabs.fasting')}</Label>
       </NativeTabs.Trigger>
       <NativeTabs.Trigger name="challenges">
         <Icon sf="trophy.fill" drawable="custom_android_drawable" />
-        <Label>挑战</Label>
+        <Label>{t('statistics.tabs.challenges')}</Label>
       </NativeTabs.Trigger>
       <NativeTabs.Trigger name="personal">
         <Icon sf="person.fill" drawable="custom_settings_drawable" />
-        <Label>我的</Label>
+        <Label>{t('statistics.tabs.personal')}</Label>
       </NativeTabs.Trigger>
     </NativeTabs>
   }
@@ -203,11 +205,11 @@ export default function TabLayout() {
       screenOptions={({ route }) => getScreenOptions(route.name)}
     >
 
-      <Tabs.Screen name="statistics" options={{ title: '健康' }} />
-      <Tabs.Screen name="medications" options={{ title: '用药' }} />
-      <Tabs.Screen name="fasting" options={{ title: '断食' }} />
-      <Tabs.Screen name="challenges" options={{ title: '挑战' }} />
-      <Tabs.Screen name="personal" options={{ title: '个人' }} />
+      <Tabs.Screen name="statistics" options={{ title: t('statistics.tabs.health') }} />
+      <Tabs.Screen name="medications" options={{ title: t('statistics.tabs.medications') }} />
+      <Tabs.Screen name="fasting" options={{ title: t('statistics.tabs.fasting') }} />
+      <Tabs.Screen name="challenges" options={{ title: t('statistics.tabs.challenges') }} />
+      <Tabs.Screen name="personal" options={{ title: t('statistics.tabs.personal') }} />
     </Tabs>
   );
 }