feat(audio): add new audio assets and replace old wav files

1. add new mp3 format audio files and their meta configuration files
2. delete old unused wav format audio files and their meta files
3. add flash effect audio playback logic in skill casting system

assets/script/game/hero/SCastSystem.ts

@@ -229,6 +229,9 @@ export class SCastSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
             heroView.playOther('yellow')
         }
 
+        // 播放特殊技能触发音效
+        oops.audio.playEffect("music/flash");
+
         // 如果是敌方攻击技能，必须在战斗中才能释放；友方增益/护盾则允许在非战斗中释放
         let config = SkillSet[s_uuid];
         if (!config) return;