Add server and mini-program pagination for shared lists

weapp/pages/punch/punch.wxml

@@ -3,7 +3,7 @@
 <!-- pages/punch/punch.wxml - 情侣打卡 -->
 <app-nav title="打卡" back="{{true}}" />
 
-<scroll-view class="page-bg" scroll-y show-scrollbar="{{false}}" bounces="{{true}}">
+<scroll-view class="page-bg" scroll-y bindscrolltolower="loadMore" lower-threshold="120" show-scrollbar="{{false}}" bounces="{{true}}">
   <view class="c-body"><view class="c-heading j-row"><view><text class="j-eyebrow">LITTLE PROMISES</text><text class="j-page-title">把约定变成习惯</text></view><button class="j-button j-button-small" bindtap="showAddModal">＋ 添加</button></view>
 <page-state wx:if="{{loading}}" kind="loading" title="正在加载" /><page-state wx:elif="{{loadError}}" kind="error" title="加载失败" description="请检查网络后重新加载" action="重试" bind:action="loadData" />
     <!-- 顶部 Banner - 卡片式 -->
@@ -83,6 +83,7 @@
     <page-state wx:if="{{!loading && !loadError && !checkins.length}}" title="从一个小约定开始" description="一起运动、按时吃饭，也可以成为日常仪式" action="添加打卡" bind:action="showAddModal" />
   </view>
   
+<view class="j-pagination" wx:if="{{!loading && !loadError && total > 0}}"><text wx:if="{{loadingMore}}">正在加载…</text><text wx:elif="{{moreError}}" bindtap="loadMore">加载失败，点击重试</text><text wx:elif="{{hasMore}}" bindtap="loadMore">加载更多</text><text wx:else>已加载全部</text></view>
 </scroll-view>
 
 <!-- 浮动按钮 -->