refactor(伤害系统): 将caster从HeroViewComp改为使用casterEid

统一伤害系统中施法者的标识方式，从直接使用HeroViewComp改为使用实体ID(casterEid)
修复反伤逻辑中可能存在的空指针问题

assets/script/game/hero/DamageQueueComp.ts

@@ -10,8 +10,8 @@ export interface DamageEvent {
     /** 伤害属性数据 */
     Attrs: any;
     
-    /** 施法者 */
-    caster: HeroViewComp;
+    /** 施法者ID */
+    casterEid: number;
     
     /** 技能UUID */
     s_uuid: number;
@@ -58,14 +58,13 @@ export class DamageQueueComp extends ecs.Comp {
     /**
      * 添加伤害事件到队列
      */
-    addDamageEvent(attrs: any, caster: HeroViewComp, s_uuid: number,ext_dmg:number=0,dmg_ratio:number=1): void {
+    addDamageEvent(attrs: any, casterEid: number, s_uuid: number,ext_dmg:number=0,dmg_ratio:number=1): void {
         const timestamp = Date.now();
-        const casterEid = caster?.ent?.eid ?? -1;
         const eventId = `${casterEid}_${s_uuid}_${timestamp}_${Math.random()}`;
         
         const damageEvent: DamageEvent = {
             Attrs: attrs ? { ...attrs } : null, // 深拷贝属性数据
-            caster: caster,
+            casterEid: casterEid,
             s_uuid: s_uuid,
             timestamp: timestamp,
             eventId: eventId,
@@ -161,7 +160,7 @@ export class DamageQueueHelper {
      * 为实体添加伤害事件
      * 如果实体没有伤害队列组件，会自动创建
      */
-    static addDamageToEntity(entity: ecs.Entity, attrs: any, caster: HeroViewComp, s_uuid: number,ext_dmg:number=0,dmg_ratio:number=1): void {
+    static addDamageToEntity(entity: ecs.Entity, attrs: any, casterEid: number, s_uuid: number,ext_dmg:number=0,dmg_ratio:number=1): void {
         let damageQueue = entity.get(DamageQueueComp);
         
         // 如果实体没有伤害队列组件，创建一个
@@ -170,7 +169,7 @@ export class DamageQueueHelper {
         }
         
         // 添加伤害事件到队列
-        damageQueue.addDamageEvent(attrs, caster, s_uuid,ext_dmg,dmg_ratio);
+        damageQueue.addDamageEvent(attrs, casterEid, s_uuid,ext_dmg,dmg_ratio);
     }
     
     /**