opt: model (#851)

* opt: readlist model

* opt: video item model

lib/models/common/video/video_quality.dart

@@ -1,55 +1,23 @@
 enum VideoQuality {
-  speed240,
-  fluent360,
-  clear480,
-  high720,
-  high72060,
-  high1080,
-  high1080plus,
-  high108060,
-  super4K,
-  hdr,
-  dolbyVision,
-  super8k
-}
-
-extension VideoQualityExt on VideoQuality {
-  static const List<int> _codeList = [
-    6,
-    16,
-    32,
-    64,
-    74,
-    80,
-    112,
-    116,
-    120,
-    125,
-    126,
-    127,
-  ];
-  int get code => _codeList[index];
-
-  static VideoQuality? fromCode(int code) {
-    final index = _codeList.indexOf(code);
-    if (index != -1) {
-      return VideoQuality.values[index];
-    }
-    return null;
-  }
-
-  String get description => const [
-        '240P 极速',
-        '360P 流畅',
-        '480P 清晰',
-        '720P 高清',
-        '720P60 高帧率',
-        '1080P 高清',
-        '1080P+ 高码率',
-        '1080P60 高帧率',
-        '4K 超清',
-        'HDR 真彩色',
-        '杜比视界',
-        '8K 超高清'
-      ][index];
+  speed240(6, '240P 极速'),
+  fluent360(16, '360P 流畅'),
+  clear480(32, '480P 清晰'),
+  high720(64, '720P 高清'),
+  high72060(74, '720P60 高帧率'),
+  high1080(80, '1080P 高清'),
+  high1080plus(112, '1080P+ 高码率'),
+  high108060(116, '1080P60 高帧率'),
+  super4K(120, '4K 超清'),
+  hdr(125, 'HDR 真彩色'),
+  dolbyVision(126, '杜比视界'),
+  super8k(127, '8K 超高清');
+
+  final int code;
+  final String description;
+
+  const VideoQuality(this.code, this.description);
+
+  static final _codeMap = {for (var i in values) i.code: i};
+
+  static VideoQuality fromCode(int code) => _codeMap[code]!;
 }