refactor: 重构buff系统，移除预定义buff列表

- 将SkillConfig.buffs字段改为直接存储BuffConf对象数组
- 移除预定义的BuffsList和相关导入引用
- 简化SCastSystem中buff应用逻辑，直接使用配置对象
- 移除CardComp中Buff/Debuff类型的图标获取逻辑
- 简化HeroAttrsComp调试日志，移除buff名称显示

assets/script/game/hero/HeroAttrsComp.ts

@@ -125,7 +125,7 @@ export class HeroAttrsComp extends ecs.Comp {
     addBuff(buffConf: BuffConf) {
         this.applyAttrChange(buffConf.buff, buffConf.value);
         if (this.debugMode) {
-            mLogger.log(this.debugMode, 'HeroAttrs', `添加属性: ${buffConf.name}, 属性:${buffConf.buff}, 值:${buffConf.value}`);
+            mLogger.log(this.debugMode, 'HeroAttrs', `属性:${buffConf.buff}, 值:${buffConf.value}`);
         }
     }