Add server and mini-program pagination for shared lists

weapp/pages/albums/albums.wxml

@@ -3,7 +3,7 @@
 <!-- pages/albums/albums.wxml - 相册列表 -->
 <app-nav title="{{uploadMode ? '选择相册' : '相册'}}" 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="j-body"><view class="j-row"><view><text class="j-eyebrow">MOMENTS WE KEEP</text><text class="j-page-title">{{uploadMode ? '选择上传照片的相册' : '照片里的日常'}}</text></view><button class="j-button j-button-small" bindtap="goToPublish">＋ 建相册</button></view>
 <page-state wx:if="{{loading}}" kind="loading" title="正在打开相册" /><page-state wx:elif="{{loadError}}" kind="error" title="加载失败" action="重试" bind:action="loadAlbums" />
 <view class="j-album-list" wx:else><view class="j-album-print" wx:for="{{albums}}" wx:key="id" bindtap="openAlbum" data-id="{{item.id}}"><image wx:if="{{item.cover}}" src="{{item.cover}}" mode="aspectFill" /><view wx:else class="j-album-placeholder"><image src="/images/album.svg" /><text>还没有照片</text></view><view class="j-row"><view><text class="j-story-title">{{item.title || '我们的相册'}}</text><text class="j-caption">{{item.photo_count || 0}} 张照片</text></view><view class="j-link j-album-menu" catchtap="showMoreMenu" data-id="{{item.id}}" data-title="{{item.title}}" data-desc="{{item.description}}" data-cover="{{item.cover}}">•••</view></view><text wx:if="{{item.description}}" class="j-caption">{{item.description}}</text></view></view>
@@ -41,6 +41,7 @@
     </view>
   </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>