fix(cast&skill): 修复技能预制体加载问题，重构代码并添加调试日志

为SCastSystem添加多处调试日志，便于排查技能施法相关问题
重构Skill类的load方法，将同步预制体获取改为异步加载逻辑
封装重复的技能节点初始化逻辑为内部函数，提升代码可读性
修复预制体未预加载时无法创建技能实体的问题

assets/script/game/hero/SCastSystem.ts

@@ -128,9 +128,13 @@ export class SCastSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
                 targetPos = this.resolveEnemyCastTargetPos(config, mockAttrs, mockView, target, maxRange);
             }
             // 如果全屏都没找到敌人，直接放弃释放伤害技能
-            if (!targetPos) return;
+            if (!targetPos) {
+                console.log("[SCastSystem] forceCastCardSkill: no enemy found for skill", s_uuid);
+                return;
+            }
         }
         
+        console.log("[SCastSystem] forceCastCardSkill: casting skill", s_uuid, "castTimes", castTimes, "targetPos", targetPos);
         for (let i = 0; i < castTimes; i++) {
             if (isFriendly) {
                 const friendlyTargets = this.resolveFriendlyTargets(targetEids, FacSet.HERO);
@@ -147,7 +151,10 @@ export class SCastSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
     private createSkillEntityForCard(s_uuid: number, skillLv: number, mockAttrs: HeroAttrsComp, startPos: Vec3, targetPos: Vec3 | null, castIndex: number = 0, overrides?: SkillOverrides) {
         const scene = smc.map.MapView.scene;
         const parent = scene.entityLayer?.node?.getChildByName("SKILL");
-        if (!parent || !targetPos) return;
+        if (!parent || !targetPos) {
+            console.log("[SCastSystem] createSkillEntityForCard failed: parent or targetPos missing", !!parent, !!targetPos);
+            return;
+        }
 
         const skill = ecs.getEntity<Skill>(Skill);
         const actualStartPos = this.resolveRepeatCastStartPos(startPos, castIndex);
@@ -160,6 +167,7 @@ export class SCastSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
         } as any;
 
         skill.load(actualStartPos, parent, s_uuid, targetPos.clone(), mockView, mockAttrs, skillLv, 0, overrides);
+        console.log("[SCastSystem] createSkillEntityForCard success for skill", s_uuid);
     }
     /** 空施法计划：用于“当前无可施法技能”时的统一返回 */
     private readonly emptyCastPlan = { skillId: 0, skillLv: 1, isFriendly: false, targetPos: null as Vec3 | null, targetEids: [] as number[], overrides: undefined as SkillOverrides | undefined };