chore(admin-web): drop redundant publish hint copy from media view

Remove the immediate/queued publish hint sentences and the explanatory
alert block, and hide the card footer when there's nothing to show.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/admin-web/src/views/MediaView.vue

@@ -159,12 +159,6 @@ function resolvePublishState(account: DesktopAccountInfo): PublishState {
 }
 
 function resolvePublishHint(account: DesktopAccountInfo, publishState: PublishState): string {
-  if (publishState === "immediate") {
-    return "客户端在线，RabbitMQ 事件会立即唤醒桌面端消费发布任务。";
-  }
-  if (publishState === "queued") {
-    return "客户端离线，发布任务会先落库保留，等桌面端恢复在线后继续消费。";
-  }
   if (account.health !== "live") {
     return "授权状态异常，先在桌面端重新校验后再发布。";
   }
@@ -320,13 +314,6 @@ async function refreshAll(): Promise<void> {
       </div>
     </section>
 
-    <a-alert
-      type="info"
-      show-icon
-      message="桌面端是账号和会话的真实持有者"
-      description="页面在线态由 Redis presence 和最近心跳综合判断。在线客户端会被 RabbitMQ 立即唤醒；离线客户端的任务会先落库排队，等桌面端恢复在线后继续消费。"
-    />
-
     <section class="panel media-list-panel">
       <div class="media-list-toolbar">
         <a-input
@@ -420,11 +407,11 @@ async function refreshAll(): Promise<void> {
               </div>
             </div>
 
-            <div class="media-card__footer">
+            <div v-if="account.deleteRequestedAt || account.publishHint" class="media-card__footer">
               <span v-if="account.deleteRequestedAt" class="footer-badge footer-badge--warning">
                 已申请解绑
               </span>
-              <span v-else class="footer-badge">
+              <span v-else-if="account.publishHint" class="footer-badge">
                 {{ account.publishHint }}
               </span>
             </div>