feat: add YesPlayMusic-style home page with daily recs, FM, and user playlists

Add backend endpoints for daily recommended songs, personal FM, user
playlists, and playlist detail. Extend NeteaseProvider and MusicProvider
interface with getDailyRecommendSongs and getUserPlaylists. Rewrite Home
page with FM card, daily recommendations grid, and user playlists section.
Fix Playlist view to fetch detail and songs from separate endpoints.

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

web/src/views/Playlist.vue

@@ -8,9 +8,9 @@
         <CoverArt :url="playlist.coverUrl" :size="200" :radius="14" :show-shadow="true" />
         <div class="playlist-meta">
           <h1 class="playlist-title">{{ playlist.name }}</h1>
-          <p class="playlist-desc">{{ playlist.description }}</p>
+          <p class="playlist-desc" v-if="playlist.description">{{ playlist.description }}</p>
           <div class="playlist-stats">
-            {{ playlist.songCount }} 首歌曲
+            {{ songs.length }} 首歌曲
           </div>
           <button class="play-all-btn" @click="playAll">
             <Icon icon="mdi:play" />
@@ -32,6 +32,8 @@
         />
       </div>
     </template>
+
+    <div v-else class="loading">歌单不存在或加载失败</div>
   </div>
 </template>
 
@@ -55,8 +57,18 @@ interface PlaylistDetail {
   songCount: number;
 }
 
+interface SongItem {
+  id: string;
+  name: string;
+  artist: string;
+  album: string;
+  duration: number;
+  coverUrl: string;
+  platform: string;
+}
+
 const playlist = ref<PlaylistDetail | null>(null);
-const songs = ref<Array<{ id: string; name: string; artist: string; album: string; duration: number; coverUrl: string; platform: string }>>([]);
+const songs = ref<SongItem[]>([]);
 const loading = ref(true);
 
 async function playAll() {
@@ -74,11 +86,12 @@ onMounted(async () => {
   const platform = (route.query.platform as string) || 'netease';
 
   try {
-    const res = await axios.get(`/api/music/playlist/${id}`, {
-      params: { platform },
-    });
-    playlist.value = res.data.playlist;
-    songs.value = res.data.songs;
+    const [detailRes, songsRes] = await Promise.all([
+      axios.get(`/api/music/playlist/${id}/detail`, { params: { platform } }),
+      axios.get(`/api/music/playlist/${id}`, { params: { platform } }),
+    ]);
+    playlist.value = detailRes.data.playlist;
+    songs.value = songsRes.data.songs;
   } catch {
     // Ignore if API not ready
   } finally {