Add business intelligence big screen template

app/page.tsx

@@ -8,6 +8,11 @@ export default function Home() {
     <>
       <AdminApp />
       <nav className={styles.launcherStack} aria-label="模板功能入口">
+        <Link className={`${styles.launcher} ${styles.bigscreen}`} href="/bigscreen">
+          <span className={styles.launcherIcon}>▥</span>
+          <span><strong>数据大屏</strong><small>经营指挥中心</small></span>
+          <b>→</b>
+        </Link>
         <Link className={`${styles.launcher} ${styles.kanban}`} href="/kanban">
           <span className={styles.launcherIcon}>▦</span>
           <span><strong>泳道看板</strong><small>拖拽变更卡片状态</small></span>