refactor(skill): 重构伤害计算逻辑

- 删除SkillEnt.ts及其meta文件，简化技能实体管理
- 将SDataCom重命名为更清晰的DmgDataCom和SDataCom
- 重构伤害计算系统，增加命中检测和伤害类型处理
- 优化技能碰撞检测逻辑，支持范围伤害和数量限制

assets/script/game/hero/SCastSystem.ts

@@ -3,7 +3,6 @@ import { Vec3, v3 } from "cc";
 import { HeroAttrsComp } from "./HeroAttrsComp";
 import { HeroViewComp } from "./HeroViewComp";
 import { SkillSet, SType } from "../common/config/SkillSet";
-import { SkillEnt } from "../skill/SkillEnt";
 import { HeroSkillsComp } from "./HeroSkills";
 import { Skill } from "../skill/Skill";
 import { CSRequestComp } from "../skill/STagComps";