Add server and mini-program pagination for shared lists

weapp/pages/diary_detail/diary_detail.wxml

@@ -3,7 +3,7 @@
 <app-nav title="日记详情" back="{{true}}" /><view class="page-bg">
 
 <view class="read-state" wx:if="{{loading || loadError}}"><page-state wx:if="{{loading}}" kind="loading" title="正在加载日记" /><page-state wx:else kind="error" title="日记加载失败" action="重试" bind:action="loadDiary" /></view>
-<scroll-view scroll-y class="read-scroll" wx:if="{{!loading && !loadError && diary}}" show-scrollbar="{{false}}" enhanced>
+<scroll-view scroll-y bindscrolltolower="loadMoreComments" lower-threshold="120" class="read-scroll" wx:if="{{!loading && !loadError && diary}}" show-scrollbar="{{false}}" enhanced>
   <view class="read-page">
     <view class="read-author"><image class="read-avatar" src="{{diary.creator_avatar || '/images/default-avatar.svg'}}" mode="aspectFill" /><view class="read-author-info"><text class="read-name">{{diary.creator_name || 'TA'}}</text><text class="read-date">{{diary.created_time}}</text><text class="read-location" wx:if="{{diary.location_text}}">{{diary.location_text}}</text></view><view class="read-menu" catchtap="onMoreTap" aria-label="日记操作"><image src="/images/more.svg" mode="aspectFit" /></view></view>
     <view class="read-paper">
@@ -58,6 +58,8 @@
           </text>
         </view>
       </view>
+      <view class="j-pagination" wx:if="{{commentsError}}" bindtap="loadComments">留言加载失败，点击重试</view>
+      <view class="j-pagination" wx:elif="{{comments.length}}"><text wx:if="{{commentsLoadingMore}}">正在加载…</text><text wx:elif="{{commentsMoreError}}" bindtap="loadMoreComments">加载失败，点击重试</text><text wx:elif="{{hasMoreComments}}" bindtap="loadMoreComments">加载更多留言</text><text wx:else>已加载全部留言</text></view>
     </view>
 
   </view>