友圈卡片背景头像效果恢复：背景图/头像统一用自建favicon绝对地址+失败兜底，缓存key升v2

themes/Ying/layouts/page/circles.html

@@ -335,18 +335,33 @@
   <script>
     /* 站内 RSS/favicon 服务地址（友圈头像兜底用，替代原先的 cravatar 默认灰头像） */
     var RSS_API_BASE = '{{ site.Params.rssapi.base | default "https://api.200181.xyz" }}';
+    /* 统一解析头像地址：
+       绝对地址原样用；历史遗留的相对 /api/favicon... 补上 API 域名；空值则按站点地址走自建 favicon 服务 */
+    function fcAvatarUrl(post) {
+      var a = (post && post.avatar) || '';
+      if (a.indexOf('//') > 0 || a.indexOf('data:') === 0) return a;
+      if (a.charAt(0) === '/') return RSS_API_BASE + a;
+      var target = (post && (post.blogUrl || post.link)) || '';
+      return RSS_API_BASE + '/api/favicon' + (target ? '?url=' + encodeURIComponent(target) : '');
+    }
     /* 头像加载失败 → 换站内 favicon 服务；再失败就让它显示接口自带的字母兜底图 */
     function fcAvatarFallback(img) {
       img.onerror = null;
       var target = img.getAttribute('data-fallback') || '';
       img.src = RSS_API_BASE + '/api/favicon' + (target ? '?url=' + encodeURIComponent(target) : '');
     }
+    /* 卡片背景那张"若隐若现"的头像：失败先换站内 favicon，仍失败才淡出（保证效果尽量在） */
+    function fcBgFallback(img) {
+      img.onerror = function () { img.style.opacity = 0; };
+      var target = img.getAttribute('data-fallback') || '';
+      img.src = RSS_API_BASE + '/api/favicon' + (target ? '?url=' + encodeURIComponent(target) : '');
+    }
 
     window.FriendCircle = {
       allPosts: [],
       currentIndex: 0,
       BATCH_SIZE: 10,
-      CACHE_KEY: 'friend-circle-v1',
+      CACHE_KEY: 'friend-circle-v2',
       CACHE_OPTIONS: {
         version: 2,
         softTtl: 5 * 60 * 1000,
@@ -374,16 +389,17 @@
         let html = "";
         posts.forEach((post, index) => {
           const dateStr = this.timeAgo(post.date);
-          const bgImageSrc = post.avatar;
+          const avatarUrl = fcAvatarUrl(post);
+          const bgImageSrc = avatarUrl;
           const description = post.description ? post.description.replace(/"/g, '&quot;') : '';
           const delay = index * 100;
 
           html += '<a href="' + post.link + '" target="_blank" class="fc-item" data-desc="' + description + '" data-title="' + post.title + '" uk-scrollspy="cls: uk-animation-slide-bottom-small; delay: ' + delay + '">'
             + '<div class="fc-title" title="' + post.title + '">' + post.title + '</div>'
-            + '<img src="' + bgImageSrc + '" class="fc-bg-image" onerror="this.style.opacity=0">'
+            + '<img src="' + bgImageSrc + '" class="fc-bg-image" data-fallback="' + (post.blogUrl || post.link || '') + '" onerror="fcBgFallback(this)">'
             + '<div class="fc-bottom">'
               + '<div class="fc-author-pill">'
-                + '<img src="' + post.avatar + '" class="fc-avatar" data-fallback="' + (post.blogUrl || post.link || '') + '" onerror="fcAvatarFallback(this)">'
+                + '<img src="' + avatarUrl + '" class="fc-avatar" data-fallback="' + (post.blogUrl || post.link || '') + '" onerror="fcAvatarFallback(this)">'
                 + '<span class="fc-author-name">' + post.author + '</span>'
               + '</div>'
               + '<div class="fc-date"><i class="ri-calendar-line"></i> ' + dateStr + '</div>'
@@ -469,10 +485,7 @@
                 link: a.link || '',
                 date: a.pubDate || '',
                 author: a.feedName || a.author || '',
-                // 源里没图标 → 用站内 favicon 服务（返回真实图标或字母 SVG，不是灰头像）
-                avatar: a.favicon || (a.siteUrl || a.link
-                  ? RSS_API_BASE + '/api/favicon?url=' + encodeURIComponent(a.siteUrl || a.link)
-                  : ''),
+                avatar: a.favicon || '',  // 渲染时统一由 fcAvatarUrl() 解析（含相对地址/空值兜底）
                 blogUrl: a.siteUrl || '',
                 image: null,
                 description: ''