fix: filter out ad/live/invalid cards from recommend feed

推荐流中混入广告、直播等特殊条目，缺少 pic/duration/bvid 字段，
导致页面出现空白卡片。过滤掉不满足条件的条目。

services/bilibili.ts

@@ -76,12 +76,14 @@ export async function getRecommendFeed(freshIdx = 0): Promise<VideoItem[]> {
   );
   const res = await api.get('/x/web-interface/wbi/index/top/feed/rcmd', { params: signed });
   const items: any[] = res.data.data?.item ?? [];
-  return items.map(item => ({
+  return items
+    .map(item => ({
       ...item,
       aid: item.id ?? item.aid,
       pic: item.pic ?? item.cover,
       owner: item.owner ?? { mid: 0, name: item.owner_info?.name ?? '', face: item.owner_info?.face ?? '' },
-  })) as VideoItem[];
+    }))
+    .filter((item: any) => item.bvid && (item.pic || item.cover) && item.duration > 0) as VideoItem[];
 }
 
 export async function getPopularVideos(pn = 1): Promise<VideoItem[]> {