refactor(HeroSkills): 优化技能冷却时间计算逻辑

使用技能配置中的hset属性代替数组索引判断攻击类型
添加速度加成下限保护防止除零错误
简化条件判断并移除冗余代码

assets/script/game/hero/HeroSkills.ts

@@ -145,16 +145,11 @@ export class HeroSkillsComp extends ecs.Comp {
         const skill = this.getSkill(s_uuid);
         if (!skill) return;
 
-        // 普通攻击（skills[0]）受 AS 影响，其余技能受 SS 影响
-        const isNormalAttack = s_uuid === this.skills[0]?.s_uuid;
-        const speedAttr = isNormalAttack ? Attrs.AS : Attrs.SS;
-        const speedBonus = attrsCom.Attrs[speedAttr] / 100; // 100 表示 100% 提速
-        const speedMultiplier = 1 / (1 + speedBonus);      // 提速 100% => cd 减半
-
-        skill.cd = skill.cd_max * speedMultiplier;
-        if (skill) {
-            skill.cd = skill.cd_max;
-        }
+        const speedAttr = skill.hset === HSSet.atk ? Attrs.AS : Attrs.SS;
+        const rawSpeed = attrsCom.Attrs?.[speedAttr] ?? 0;
+        const speedBonus = Math.max(-0.9, rawSpeed / 100);
+        const speedMultiplier = 1 / (1 + speedBonus);
+        skill.cd = Math.max(0, skill.cd_max * speedMultiplier);
     }
 
 
@@ -274,4 +269,4 @@ export class HeroSkillsComp extends ecs.Comp {
     setMaxAuto(on: boolean) {
         this.max_auto = on;
     }
-}
+}