feat: 优化媒体服务器库和播放列表的添加逻辑，避免重复项

src/views/dashboard/MediaServerLibrary.vue

@@ -26,7 +26,11 @@ async function loadLibrary(server: string) {
       params: { server: server, hidden: true },
     })
     if (result && result.length > 0) {
-      libraryList.value = libraryList.value.concat(result)
+      // 不存在时添加
+      for (const item of result) {
+        const index = libraryList.value.findIndex(i => i.id === item.id)
+        if (index === -1) libraryList.value.push(item)
+      }
     }
   } catch (e) {
     console.log(e)

src/views/dashboard/MediaServerPlaying.vue

@@ -24,7 +24,11 @@ async function loadPlayingList(server: string) {
   try {
     const result: MediaServerPlayItem[] = await api.get('mediaserver/playing', { params: { server } })
     if (result && result.length > 0) {
-      playingList.value = playingList.value.concat(result)
+      // 不存在时添加
+      for (const item of result) {
+        const index = playingList.value.findIndex(i => i.id === item.id)
+        if (index === -1) playingList.value = playingList.value.concat(result)
+      }
     }
   } catch (e) {
     console.log(e)