feat(web): include removed in visible stats; cover bang badge

站内展示/统计统一 VISIBLE（含 removed）：热度、UP 列表、总览
active_ups/初导入计数、说明页粉丝覆盖、黑名单视频数。采集队列仍
只 active/unfaved。失效片封面右上角感叹号徽标，点击/tap 提示
「该视频已失效」；手动/候选入库仍可复活 removed→active。

reaction_board/web/static/components.js

@@ -13,6 +13,13 @@ export function cover(item, className = "thumb") {
     loading="lazy" referrerpolicy="no-referrer"></div>`;
 }
 
+
+export function removedCoverMark(item) {
+  if (item?.status !== "removed") return "";
+  return `<button type="button" class="cover-removed-mark" data-removed-tip
+    title="该视频已失效" aria-label="该视频已失效">!</button>`;
+}
+
 export function rankBadge(rank, className = "rank-badge") {
   if (!rank) return "";
   const top = rank <= 3 ? ` rank-${rank}` : "";
@@ -73,6 +80,7 @@ export function videoCard(item, {
       <div class="video-cover">
         ${cover(item, "video-thumb")}
         ${durationBadge}
+        ${removedCoverMark(item)}
       </div>
       <div class="video-card-body">
         <h3 class="video-title">${title}</h3>
@@ -150,6 +158,7 @@ export function mediaCard(item, { rank = null, highlight = "" } = {}) {
     <div class="media-cover">
       ${cover(item, "media-thumb")}
       ${durationBadge}
+      ${removedCoverMark(item)}
     </div>
     <span class="media-title">${escapeHtml(item.title || "(无标题)")}</span>
     <span class="media-byline">