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

utils/menstrualCycle.ts

@@ -1,4 +1,6 @@
 import dayjs, { Dayjs } from 'dayjs';
+import 'dayjs/locale/en';
+import 'dayjs/locale/zh-cn';
 import { MenstrualFlowSample } from './health';
 
 export type MenstrualDayStatus = 'period' | 'predicted-period' | 'fertile' | 'ovulation-day';
@@ -153,6 +155,9 @@ export const buildMenstrualTimeline = (options?: {
   monthsAfter?: number;
   defaultCycleLength?: number;
   defaultPeriodLength?: number;
+  locale?: 'zh' | 'en';
+  monthTitleFormat?: string;
+  monthSubtitleFormat?: string;
 }): MenstrualTimeline => {
   const today = dayjs();
   const monthsBefore = options?.monthsBefore ?? 2;
@@ -267,6 +272,11 @@ export const buildMenstrualTimeline = (options?: {
   const months: MenstrualMonth[] = [];
   let monthCursor = startMonth.startOf('month');
 
+  const locale = options?.locale ?? 'zh';
+  const localeKey = locale === 'en' ? 'en' : 'zh-cn';
+  const monthTitleFormat = options?.monthTitleFormat ?? (locale === 'en' ? 'MMM' : 'M月');
+  const monthSubtitleFormat = options?.monthSubtitleFormat ?? (locale === 'en' ? 'YYYY' : 'YYYY年');
+
   while (monthCursor.isBefore(endMonth) || monthCursor.isSame(endMonth, 'month')) {
     const firstDay = monthCursor.startOf('month');
     const daysInMonth = firstDay.daysInMonth();
@@ -298,10 +308,12 @@ export const buildMenstrualTimeline = (options?: {
       });
     }
 
+    const formattedMonth = firstDay.locale(localeKey);
+
     months.push({
       id: firstDay.format('YYYY-MM'),
-      title: firstDay.format('M月'),
-      subtitle: firstDay.format('YYYY年'),
+      title: formattedMonth.format(monthTitleFormat),
+      subtitle: formattedMonth.format(monthSubtitleFormat),
       cells,
     });