feat(hero): 添加技能特效播放接口并优化英雄资源

- 在 HeroViewComp 中添加 palayBuff、palayReady、playEnd 方法用于播放技能特效
- 删除未使用的 buff 预制体（maxy、foot_jiasu）及其元数据
- 调整 heal 预制体的位置、尺寸和动画参数以优化显示效果
- 简化多个英雄预制体结构，移除嵌套的 up 节点以提升性能
- 更新 SkillSet 配置，为技能添加 readyAnm 和 endAnm 字段支持

assets/script/game/hero/HeroViewComp.ts

@@ -293,7 +293,30 @@ export class HeroViewComp extends CCComp {
     shield_tip(absorbed: number) {
         this.hp_tip(TooltipTypes.life, absorbed.toFixed(0));
     }
-    
+    public palayBuff(anm: string = ""){
+        if(anm==="") return;
+        var path = "game/skill/buff/" + anm;
+        var prefab: Prefab = oops.res.get(path, Prefab)!;
+        var node = instantiate(prefab);
+        node.parent = this.node;
+    }
+
+    public palayReady(anm: string = ""){
+        if(anm==="") return;
+        var path = "game/skill/ready/" + anm;
+        var prefab: Prefab = oops.res.get(path, Prefab)!;
+        var node = instantiate(prefab);
+        node.parent = this.node;
+    }
+
+    public playEnd(anm: string = ""){
+        if(anm==="") return;
+        var path = "game/skill/end/" + anm;
+        var prefab: Prefab = oops.res.get(path, Prefab)!;
+        var node = instantiate(prefab);
+        node.parent = this.node;
+    }
+
     /** 治疗特效 */
     private heathed() {
         var path = "game/skill/buff/heathed";