refactor: 移除技能配置中的固定距离字段，改用动态计算

技能配置中不再硬编码 `dis` 距离字段，而是通过 `casterAttrs.getCachedMaxSkillDistance()` 动态获取英雄的最大技能距离。这提高了灵活性，使技能距离可以基于英雄属性动态变化。

assets/script/game/hero/SCastSystem.ts

@@ -125,7 +125,7 @@ export class SCastSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
     }
 
     private findTargets(caster: HeroViewComp, casterAttrs: HeroAttrsComp, config: SkillConfig): HeroViewComp[] {
-        const range = Number(config.dis ?? GameConst.Battle.DEFAULT_SEARCH_RANGE);
+        const range = casterAttrs.getCachedMaxSkillDistance() || GameConst.Battle.DEFAULT_SEARCH_RANGE;
         const isEnemy = config.TGroup === TGroup.Enemy;
         const isSelf = config.TGroup === TGroup.Self;
         const isTeam = config.TGroup === TGroup.Team || config.TGroup === TGroup.Ally;