refactor(skill): 移除未使用的caster引用以简化技能数据

清理SDataCom中未使用的caster属性及相关代码，减少内存占用并提升代码清晰度。技能逻辑仅依赖casterEid进行实体识别，移除冗余引用可避免潜在循环引用问题。

assets/script/game/skill/SDataCom.ts

@@ -1,6 +1,5 @@
 import { ecs } from "../../../../extensions/oops-plugin-framework/assets/libs/ecs/ECS";
 import { BoxSet } from "../common/config/GameSet";
-import { HeroViewComp } from "../hero/HeroViewComp";
 
 /** 业务层对象 */
 //技能数据
@@ -8,7 +7,6 @@ import { HeroViewComp } from "../hero/HeroViewComp";
 export class SDataCom extends ecs.Comp {
     /** 业务层组件移除时，重置所有数据为默认值 */
     Attrs:any=null
-    caster:HeroViewComp=null
     casterEid: number = -1;     // 施法者实体ID，用于安全校验
     group:BoxSet=BoxSet.HERO
     fac: number = 0;            // 0:hero 1:monster
@@ -22,7 +20,6 @@ export class SDataCom extends ecs.Comp {
         this.group=BoxSet.HERO
         this.fac=0
         this.s_uuid=0
-        this.caster=null
         this.casterEid = -1;
         this.hit_count=0
         this.max_hit_count=0