feat(技能系统): 添加施法者实体ID字段用于安全校验

在SDataCom组件中添加casterEid字段，并在Skill和SkillView中使用该字段替代原有的链式访问，提高代码安全性和可读性

assets/script/game/skill/SkillView.ts

@@ -59,7 +59,7 @@ export class SkillView extends CCComp {
     onBeginContact (seCol: Collider2D, oCol: Collider2D) {
          // 安全获取双方信息用于日志
         const casterName = this.sData.caster?.ent?.get(HeroAttrsComp)?.hero_name ?? '未知施法者';
-        const casterEid = this.sData.caster?.ent?.eid ?? '未知EID';
+        const casterEid = this.sData.casterEid;
         const targetView = oCol.getComponent(HeroViewComp);
         const targetName = targetView?.ent?.get(HeroAttrsComp)?.hero_name ?? '非英雄对象';
         const targetEid = targetView?.ent?.eid ?? '未知EID';