fix(英雄): 调整法师英雄技能冷却和治疗技能数值

- 将法师英雄技能冷却从1.4秒统一改为1.5秒，平衡游戏节奏
- 将治疗技能(6302)的ap值从300%提升至500%，增强治疗效果
- 将牧师系英雄的冰锥技能冷却从1秒改为2秒，调整辅助职业强度
- 优化常驻特效创建逻辑，使用createFxNode替代spawnAnimEndFx，避免生命周期管理问题

assets/script/game/common/config/SkillSet.ts

@@ -273,7 +273,7 @@ export const SkillSet: Record<number, SkillConfig> = {
     },
     6302: {
         uuid:6302,name:"治疗",sp_name:"buff_wind",icon:"1292",TGroup:TGroup.Team,readyAnm:"",endAnm:"",act:"atk",
-        DTType:DTType.single,kind:SkillKind.Heal,ap:300,hit_count:1,hitcd:0.2,speed:720,with:0,ready:0.1,EAnm:0,DAnm:"",IType:IType.support,
+        DTType:DTType.single,kind:SkillKind.Heal,ap:500,hit_count:1,hitcd:0.2,speed:720,with:0,ready:0.1,EAnm:0,DAnm:"",IType:IType.support,
         RType:RType.fixed,EType:EType.animationEnd,buffs:[],info:"治疗1个友方300%攻击力的生命值",
     },
     6303:{