feat(skill): 新增buff背景动画并调整箭矢技能资源

- 新增buff_bg.prefab及其动画资源，用于技能buff背景效果
- 新增arrow_big_yellow.prefab及其动画资源，添加黄色大箭矢技能
- 调整红、蓝、绿箭矢prefab的碰撞框尺寸（70×20→60×30）
- 为atk_s2.prefab添加spriteFrame并启用debugMode
- 更新SkillSet配置，调整基础技能对应的动画资源
- 优化atk02.anim和atk03.anim动画时长，移除冗余帧
- 重构箭矢动画文件结构，将atk_arrow_*重命名为arrow_*并更新引用
- 在ha1.prefab中集成buff_bg作为子节点

assets/script/game/common/config/SkillSet.ts

@@ -186,13 +186,13 @@ export interface SkillConfig {
 export const SkillSet: Record<number, SkillConfig> = {
     // ========== 基础攻击 ========== 6001-6099
     6001: {
-        uuid:6001,name:"空挥",sp_name:"atk_s1",icon:"1026",TGroup:TGroup.Enemy,TType:TType.Frontline,readyAnm:"",endAnm:"",act:"atk",DTType:DTType.single,
+        uuid:6001,name:"空挥",sp_name:"atk_s2",icon:"1026",TGroup:TGroup.Enemy,TType:TType.Frontline,readyAnm:"",endAnm:"",act:"atk",DTType:DTType.single,
         ap:100,hit_count:1,hitcd:0.2,speed:720,with:0,
         ready:0,EAnm:0,DAnm:9001,RType:RType.fixed,EType:EType.animationEnd,
         buffs:[],debuffs:[],info:"对前方目标造成100%攻击的伤害",
     },
     6002: {
-        uuid:6002,name:"电击",sp_name:"atk_s4",icon:"1173",TGroup:TGroup.Enemy,TType:TType.Frontline,readyAnm:"",endAnm:"",act:"max",DTType:DTType.single,
+        uuid:6002,name:"电击",sp_name:"atk_s3",icon:"1173",TGroup:TGroup.Enemy,TType:TType.Frontline,readyAnm:"",endAnm:"",act:"max",DTType:DTType.single,
         ap:100,hit_count:1,hitcd:0.2,speed:720,with:0,
         ready:0,EAnm:0,DAnm:9001,RType:RType.fixed,EType:EType.collision,
         buffs:[],debuffs:[],info:"对前方目标造成150%攻击的伤害",