perf(base-L5): qiankun 空闲预取收敛为仅 micro-vent-3dModal，其余按需加载

src/qiankun/apps.ts

@@ -40,7 +40,8 @@ for (const key in import.meta.env) {
   const schedulePrefetch = window.requestIdleCallback || ((cb) => setTimeout(cb, 200));
   schedulePrefetch(
     () => {
-      prefetchApps([..._apps]);
+      // [perf-base-v1] 预取收敛：仅预取最高频的 3D 子应用，其余子应用改为路由命中时按需加载，避免空闲带宽被全量预取占满
+      prefetchApps(_apps.filter((app) => app.name === 'micro-vent-3dModal'));
     },
     { timeout: 3000 } as IdleRequestOptions
   );