feat(app): 播放器增加清晰度档位入口

test/playback/play_ticket_quality_test.dart

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+// Author: fruit.com.cn
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/core/data/models/play_ticket.dart';
+
+void main() {
+  test('should_parse_all_qualities_when_ticket_returns_multiple_tracks', () {
+    final ticket = PlayTicket.fromJson(const {
+      'episodeId': '12',
+      'accessible': true,
+      'accessType': 'FREE',
+      'playUrl': '/files/episode/12.m3u8?e=1&s=abc',
+      'qualities': ['AUTO', '720P', '1080P'],
+    });
+
+    expect(ticket.qualities, ['AUTO', '720P', '1080P']);
+  });
+
+  test('should_default_to_empty_qualities_when_field_is_missing', () {
+    final ticket = PlayTicket.fromJson(const {
+      'episodeId': '12',
+      'accessible': true,
+      'accessType': 'FREE',
+      'playUrl': '/files/episode/12.mp4',
+    });
+
+    expect(ticket.qualities, isEmpty);
+  });
+}