纪念日新增农历日期显示

- 人员详情页：日期下方显示完整农历「农历 YYYY年 X月X日」
- 日历页本月纪念日列表：日期下方显示农历月日「X月X日」
- 公历事件用 solarToLunar 算当年对应农历
- 农历事件按当年公历落点反算农历（与原始农历一致）

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pages/calendar/calendar.js

@@ -122,12 +122,14 @@ Page({
       .map(x => {
         const person = persons.find(p => p.id === x.personId)
         const date = new Date(currentYear, x._displayMonth - 1, x._displayDay)
+        const ld = lunar.solarToLunar(date)
         return {
           ...x,
           personName: person ? person.name : '未知',
           typeIcon: this.getTypeIcon(x.type),
           typeName: x.customTypeName || this.getTypeName(x.type),
           dateText: dateUtils.formatDate(date, 'MM月DD日'),
+          lunarMD: ld.lunarText,
           daysUntil: dateUtils.getDaysUntil(date)
         }
       })

pages/calendar/calendar.wxml

@@ -40,7 +40,10 @@
         <view class="event-header">
           <text class="event-icon">{{item.typeIcon}}</text>
           <text class="event-title">{{item.personName}} - {{item.typeName}}</text>
-          <text class="event-date">{{item.dateText}}</text>
+          <view class="event-date-group">
+            <text class="event-date">{{item.dateText}}</text>
+            <text class="event-lunar">{{item.lunarMD}}</text>
+          </view>
         </view>
         <view class="event-info">
           <text wx:if="{{item.isLunar}}" class="lunar-badge">农历</text>

pages/calendar/calendar.wxss

@@ -249,11 +249,23 @@
   white-space: nowrap;
 }
 
+.event-date-group {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+  flex-shrink: 0;
+  margin-left: 12rpx;
+  gap: 2rpx;
+}
+
 .event-date {
   font-size: 24rpx;
   color: #8A8278;
-  flex-shrink: 0;
-  margin-left: 12rpx;
+}
+
+.event-lunar {
+  font-size: 20rpx;
+  color: #A9A096;
 }
 
 .event-info {