feat: 顶部栏添加3D翻转滚动广告

- header-left与header-right之间新增header-center
- 胶囊容器+Phosphor喇叭图标+彩色标签+文字
- 3D rotateX上翻动画(4秒自动切换)
- 悬停暂停+移开恢复
- 毛玻璃渐变背景+hover加深
- tag-blue/green/orange/red/purple五色标签

clientarea/hgcloud/css/common/common.css

@@ -107,6 +107,107 @@ input::-webkit-inner-spin-button {
   justify-content: space-between;
   z-index: 1000;
 }
+
+/* ====== Header Center — 翻转滚动广告 ====== */
+.header-center {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex: 1;
+  min-width: 0;
+  padding: 0 24px;
+  overflow: hidden;
+}
+.announce-ticker {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  height: 28px;
+  padding: 0 14px 0 10px;
+  background: linear-gradient(135deg, rgba(79,70,229,0.06) 0%, rgba(59,130,246,0.06) 100%);
+  border: 1px solid rgba(79,70,229,0.1);
+  border-radius: 999px;
+  max-width: 420px;
+  overflow: hidden;
+  cursor: default;
+  transition: all 200ms ease-out;
+}
+.announce-ticker:hover {
+  background: linear-gradient(135deg, rgba(79,70,229,0.1) 0%, rgba(59,130,246,0.1) 100%);
+  border-color: rgba(79,70,229,0.18);
+}
+.announce-icon {
+  font-size: 14px;
+  color: var(--color-primary, #4F46E5);
+  flex-shrink: 0;
+  animation: announce-pulse 2s ease-in-out infinite;
+}
+@keyframes announce-pulse {
+  0%, 100% { opacity: 0.7; transform: scale(1); }
+  50% { opacity: 1; transform: scale(1.1); }
+}
+.announce-flipper {
+  flex: 1;
+  min-width: 0;
+  height: 28px;
+  display: flex;
+  align-items: center;
+  overflow: hidden;
+  perspective: 200px;
+}
+.announce-item {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  text-decoration: none;
+  color: inherit;
+  line-height: 28px;
+}
+.announce-item:hover { color: var(--color-primary, #4F46E5); }
+.announce-tag {
+  display: inline-block;
+  font-size: 10px;
+  font-weight: 600;
+  letter-spacing: 0.02em;
+  padding: 1px 6px;
+  border-radius: 4px;
+  line-height: 1.5;
+  flex-shrink: 0;
+}
+.tag-blue { background: rgba(59,130,246,0.12); color: #2563EB; }
+.tag-green { background: rgba(5,150,105,0.12); color: #059669; }
+.tag-orange { background: rgba(217,119,6,0.12); color: #D97706; }
+.tag-red { background: rgba(220,38,38,0.12); color: #DC2626; }
+.tag-purple { background: rgba(124,58,237,0.12); color: #7C3AED; }
+.announce-text {
+  font-size: 12px;
+  color: #374151;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+/* 翻转动画 — 3D 上翻效果 */
+.announce-flip-enter-active,
+.announce-flip-leave-active {
+  transition: all 0.4s cubic-bezier(0.23,1,0.32,1);
+}
+.announce-flip-enter {
+  opacity: 0;
+  transform: translateY(100%) rotateX(-90deg);
+}
+.announce-flip-leave-to {
+  opacity: 0;
+  transform: translateY(-100%) rotateX(90deg);
+}
+.announce-flip-enter-to,
+.announce-flip-leave {
+  opacity: 1;
+  transform: translateY(0) rotateX(0);
+}
 .search-value {
   font-size: 0.14rem;
   color: #040e34;