refactor(战斗系统): 重构攻击处理逻辑并优化击退机制

- 将闪避、暴击和击退的概率检查统一为checkChance方法
- 移除HeroAtkComp类并清理无用代码
- 新增clearTalBuffByAttr方法用于清除特定属性的天赋buff
- 修改HeroViewComp.do_atked方法支持可选击退参数
- 移除Attrs.BACK属性及相关配置

assets/script/game/hero/HeroAttrsComp.ts

@@ -425,6 +425,17 @@ export class HeroAttrsComp extends ecs.Comp {
         delete this.BUFFS_TAL[t_uuid];
         this.recalculateSingleAttr(attrIndex);
     }
+    clearTalBuffByAttr(attrIndex: number) {
+        let changed = false;
+        for (const key in this.BUFFS_TAL) {
+            const b = this.BUFFS_TAL[Number(key)];
+            if (b && b.attrIndex === attrIndex) {
+                delete this.BUFFS_TAL[Number(key)];
+                changed = true;
+            }
+        }
+        if (changed) this.recalculateSingleAttr(attrIndex);
+    }
     
     addTalent(eff: number, value: number) {
         const t = this.Talents[eff] || { value: 0, count: 0 };