feat(i18n): 全面实现应用核心功能模块的国际化支持

- 新增 i18n 翻译资源，覆盖睡眠、饮水、体重、锻炼、用药 AI 识别、步数、健身圆环、基础代谢及设置等核心模块
- 重构相关页面及组件（如 SleepDetail, WaterDetail, WorkoutHistory 等）使用 `useI18n` 钩子替换硬编码文本
- 升级 `utils/date` 工具库与 `DateSelector` 组件，支持基于语言环境的日期格式化与显示
- 完善登录页、注销流程及权限申请弹窗的双语提示信息
- 优化部分页面的 UI 细节与字体样式以适配多语言显示

app/auth/login.tsx

@@ -13,6 +13,7 @@ import { PRIVACY_POLICY_URL, USER_AGREEMENT_URL } from '@/constants/Agree';
 import { Colors } from '@/constants/Colors';
 import { useAppDispatch } from '@/hooks/redux';
 import { useColorScheme } from '@/hooks/useColorScheme';
+import { useI18n } from '@/hooks/useI18n';
 import { fetchMyProfile, login } from '@/store/userSlice';
 import Toast from 'react-native-toast-message';
 
@@ -23,6 +24,7 @@ export default function LoginScreen() {
   const color = Colors[scheme];
   const pageBackground = scheme === 'light' ? color.pageBackgroundEmphasis : color.background;
   const dispatch = useAppDispatch();
+  const { t } = useI18n();
   const AnimatedLinear = useMemo(() => Animated.createAnimatedComponent(LinearGradient), []);
 
   // 背景动效：轻微平移/旋转与呼吸动画
@@ -79,12 +81,12 @@ export default function LoginScreen() {
   const guardAgreement = useCallback((action: () => void) => {
     if (!hasAgreed) {
       Alert.alert(
-        '请先阅读并同意',
-        '继续登录前，请阅读并勾选《隐私政策》和《用户协议》。点击“同意并继续”将默认勾选并继续登录。',
+        t('login.agreement.alert.title'),
+        t('login.agreement.alert.message'),
         [
-          { text: '取消', style: 'cancel' },
+          { text: t('login.agreement.alert.cancel'), style: 'cancel' },
           {
-            text: '同意并继续',
+            text: t('login.agreement.alert.confirm'),
             onPress: () => {
               setHasAgreed(true);
               setTimeout(() => action(), 0);
@@ -96,7 +98,7 @@ export default function LoginScreen() {
       return;
     }
     action();
-  }, [hasAgreed]);
+  }, [hasAgreed, t]);
 
   const onAppleLogin = useCallback(async () => {
     if (!appleAvailable) return;
@@ -110,7 +112,7 @@ export default function LoginScreen() {
       });
       const identityToken = (credential as any)?.identityToken;
       if (!identityToken || typeof identityToken !== 'string') {
-        throw new Error('未获取到 Apple 身份令牌');
+        throw new Error(t('login.errors.appleIdentityTokenMissing'));
       }
       await dispatch(login({ appleIdentityToken: identityToken })).unwrap();
 
@@ -118,7 +120,7 @@ export default function LoginScreen() {
       await dispatch(fetchMyProfile())
 
       Toast.show({
-        text1: '登录成功',
+        text1: t('login.success.loginSuccess'),
         type: 'success',
       });
       // 登录成功后处理重定向
@@ -145,12 +147,12 @@ export default function LoginScreen() {
       console.log('err.code', err.code);
 
       if (err?.code === 'ERR_CANCELED' || err?.code === 'ERR_REQUEST_CANCELED') return;
-      const message = err?.message || '登录失败，请稍后再试';
-      Alert.alert('登录失败', message);
+      const message = err?.message || t('login.errors.loginFailed');
+      Alert.alert(t('login.errors.loginFailedTitle'), message);
     } finally {
       setLoading(false);
     }
-  }, [appleAvailable, router, searchParams?.redirectParams, searchParams?.redirectTo]);
+  }, [appleAvailable, router, searchParams?.redirectParams, searchParams?.redirectTo, dispatch, t]);
 
 
   // 登录按钮不再因未勾选协议而禁用，仅在加载中禁用
@@ -244,14 +246,14 @@ export default function LoginScreen() {
               <Ionicons name="chevron-back" size={24} color={scheme === 'dark' ? '#ECEDEE' : '#192126'} />
             </TouchableOpacity>
           )}
-          <Text style={[styles.headerTitle, { color: color.text }]}>登录</Text>
+          <Text style={[styles.headerTitle, { color: color.text }]}>{t('login.title')}</Text>
           <View style={{ width: 32 }} />
         </View>
 
         <ScrollView contentContainerStyle={styles.content} showsVerticalScrollIndicator={false}>
           <View style={styles.headerWrap}>
             <ThemedText style={[styles.title, { color: color.text }]}>Out Live</ThemedText>
-            <ThemedText style={[styles.subtitle, { color: color.textMuted }]}>健康生活，自律让我更自由</ThemedText>
+            <ThemedText style={[styles.subtitle, { color: color.textMuted }]}>{t('login.subtitle')}</ThemedText>
           </View>
 
           {/* Apple 登录 */}
@@ -276,12 +278,12 @@ export default function LoginScreen() {
                         color="#FFFFFF"
                         style={{ marginRight: 10 }}
                       />
-                      <Text style={styles.appleText}>登录中...</Text>
+                      <Text style={styles.appleText}>{t('login.loggingIn')}</Text>
                     </>
                   ) : (
                     <>
                       <Ionicons name="logo-apple" size={22} color="#FFFFFF" style={{ marginRight: 10 }} />
-                      <Text style={styles.appleText}>使用 Apple 登录</Text>
+                      <Text style={styles.appleText}>{t('login.appleLogin')}</Text>
                     </>
                   )}
                 </GlassView>
@@ -294,12 +296,12 @@ export default function LoginScreen() {
                         color="#FFFFFF"
                         style={{ marginRight: 10 }}
                       />
-                      <Text style={styles.appleText}>登录中...</Text>
+                      <Text style={styles.appleText}>{t('login.loggingIn')}</Text>
                     </>
                   ) : (
                     <>
                       <Ionicons name="logo-apple" size={22} color="#FFFFFF" style={{ marginRight: 10 }} />
-                      <Text style={styles.appleText}>使用 Apple 登录</Text>
+                      <Text style={styles.appleText}>{t('login.appleLogin')}</Text>
                     </>
                   )}
                 </View>
@@ -319,13 +321,13 @@ export default function LoginScreen() {
                 {hasAgreed && <Ionicons name="checkmark" size={14} color={color.onPrimary} />}
               </View>
             </Pressable>
-            <Text style={[styles.agreementText, { color: color.textMuted }]}>我已阅读并同意</Text>
+            <Text style={[styles.agreementText, { color: color.textMuted }]}>{t('login.agreement.readAndAgree')}</Text>
             <Pressable onPress={() => Linking.openURL(PRIVACY_POLICY_URL)}>
-              <Text style={[styles.link, { color: color.primary }]}>《隐私政策》</Text>
+              <Text style={[styles.link, { color: color.primary }]}>{t('login.agreement.privacyPolicy')}</Text>
             </Pressable>
-            <Text style={[styles.agreementText, { color: color.textMuted }]}>和</Text>
+            <Text style={[styles.agreementText, { color: color.textMuted }]}>{t('login.agreement.and')}</Text>
             <Pressable onPress={() => Linking.openURL(USER_AGREEMENT_URL)}>
-              <Text style={[styles.link, { color: color.primary }]}>《用户协议》</Text>
+              <Text style={[styles.link, { color: color.primary }]}>{t('login.agreement.userAgreement')}</Text>
             </Pressable>
           </View>