mod: 新增推荐过滤器，回退model转换修改，移除不必要的futureBuilder

lib/models/model_rec_video_item.g.dart

@@ -24,7 +24,7 @@ class RecVideoItemModelAdapter extends TypeAdapter<RecVideoItemModel> {
       uri: fields[4] as String?,
       pic: fields[5] as String?,
       title: fields[6] as String?,
-      duration: fields[7] as String?,
+      duration: fields[7] as int?,
       pubdate: fields[8] as int?,
       owner: fields[9] as Owner?,
       stat: fields[10] as Stat?,
@@ -87,7 +87,7 @@ class StatAdapter extends TypeAdapter<Stat> {
       for (int i = 0; i < numOfFields; i++) reader.readByte(): reader.read(),
     };
     return Stat(
-      view: fields[0] as String?,
+      view: fields[0] as int?,
       like: fields[1] as int?,
       danmu: fields[2] as int?,
     );