feat: B站首页推荐 — 个性化推荐/音乐区排行/热门视频

- BiliBiliProvider.getDailyRecommendSongs: 个性化推荐（登录后更准确），
  fallback 到音乐区排行榜
- BiliBiliProvider.getPopularVideos: 热门视频列表
- 新增 GET /api/music/bilibili/popular 端点
- 首页新增"B站热门"板块，带B站蓝色徽标
- Store 缓存 bilibiliPopular 数据

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/src/stores/player.ts

@@ -50,6 +50,7 @@ export const usePlayerStore = defineStore('player', {
     recommendPlaylists: [] as PlaylistItem[],
     dailySongs: [] as Song[],
     userPlaylists: [] as PlaylistItem[],
+    bilibiliPopular: [] as Song[],
     lastFetchTime: 0,
   }),
 
@@ -270,10 +271,11 @@ export const usePlayerStore = defineStore('player', {
         return;
       }
 
-      const [playlistRes, dailyRes, userRes] = await Promise.allSettled([
+      const [playlistRes, dailyRes, userRes, biliRes] = await Promise.allSettled([
         axios.get('/api/music/recommend/playlists'),
         axios.get('/api/music/recommend/songs'),
         axios.get('/api/music/user/playlists'),
+        axios.get('/api/music/bilibili/popular?limit=12'),
       ]);
 
       if (playlistRes.status === 'fulfilled') {
@@ -285,6 +287,9 @@ export const usePlayerStore = defineStore('player', {
       if (userRes.status === 'fulfilled') {
         this.userPlaylists = userRes.value.data.playlists;
       }
+      if (biliRes.status === 'fulfilled') {
+        this.bilibiliPopular = biliRes.value.data.songs;
+      }
 
       this.lastFetchTime = Date.now();
     },