refactor(skill): 重构技能触发逻辑，提取统一工具类

将分散在Hero、Mon、HeroAtkSystem、SCastSystem、MissionComp中的技能触发代码统一封装，集中处理触发次数加成、实体合法性校验与技能事件派发，同时新增SkillTriggerType枚举统一管理技能触发类型，简化业务调用并消除重复模板代码。

assets/script/game/hero/Mon.ts

@@ -8,7 +8,8 @@ import { HeroAttrsComp } from "./HeroAttrsComp";
 import { HeroViewComp } from "./HeroViewComp";
 import { MoveComp } from "./MoveComp";
 import { MonMoveComp } from "./MonMoveComp";
-import { GameEvent } from "../common/config/GameEvent";
+import { GameEvent, SkillTriggerType } from "../common/config/GameEvent";
+import { SkillTriggerHelper } from "./SkillTriggerHelper";
 /** 怪物实体：负责怪物对象池复用、属性初始化、入场动画与回收 */
 @ecs.register(`Monster`)
 export class Monster extends ecs.Entity {
@@ -232,16 +233,7 @@ export class Monster extends ecs.Entity {
                 }
 
                 // 落地后触发 call 技能
-                if (model.call && model.call.length > 0) {
-                    model.call.forEach((uuid: number) => {
-                        oops.message.dispatchEvent(GameEvent.TriggerSkill, {
-                            s_uuid: uuid,
-                            heroAttrs: model,
-                            heroView: view,
-                            triggerType: 'call'
-                        });
-                    });
-                }
+                SkillTriggerHelper.trigger(SkillTriggerType.Call, model, view);
             })
             .start();
         // 维护关卡内怪物数量统计