style: 首页广告位优化——移除冗余描述、标题居中、轮播控件透明化

frontend/src/pages/front/LandingPage.tsx

@@ -234,7 +234,6 @@ const LandingPage: React.FC = () => {
               {banners.length > 0 && (
                 <div className="lp-ad-head">
                   <span className="lp-ad-title">精选推荐</span>
-                  <span className="lp-ad-sub">热门技能广告位 · 提升展现与下载</span>
                 </div>
               )}
               <div className="lp-carousel" onMouseEnter={() => setIsPaused(true)} onMouseLeave={() => setIsPaused(false)}>