fix(assets): 优化精灵图集布局并修复技能系统内存泄漏

- 重构精灵图集(aui.plist)布局，调整纹理坐标与旋转状态，提升图集空间利用率
- 在SCastSystem中添加onDestroy方法，注销全局事件监听，防止内存泄漏

assets/script/game/hero/SCastSystem.ts

@@ -35,6 +35,11 @@ export class SCastSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
         oops.message.on(GameEvent.TriggerSkill, this.onTriggerSkill, this);
     }
 
+    /** 系统被销毁或重置时，必须注销全局事件监听，避免内存泄漏与重复触发 */
+    onDestroy() {
+        oops.message.off(GameEvent.TriggerSkill, this.onTriggerSkill, this);
+    }
+
     private onTriggerSkill(event: string, args: { s_uuid: number, heroAttrs: HeroAttrsComp, heroView: HeroViewComp }) {
         if (!args || !args.s_uuid || !args.heroAttrs || !args.heroView) return;
         this.forceCastTriggerSkill(args.s_uuid, args.heroAttrs, args.heroView);