feat(flutter): 重构播放页并增加语言切换

lib/pages/player/widgets/player_speed_sheet.dart

@@ -5,7 +5,7 @@ import 'package:flutter/material.dart';
 import '../../../core/theme/app_colors.dart';
 import '../../../l10n/app_localizations.dart';
 
-const List<double> _speedOptions = [0.5, 0.75, 1.0, 1.25, 1.5, 2.0];
+const List<double> _speedOptions = [0.75, 1.0, 1.25, 1.5, 2.0, 3.0];
 const double _sheetRadius = 20;
 
 /// 播放倍速选择弹窗。