refactor(map): 抽象卡牌背景颜色逻辑，简化代码

将多个文件中重复的卡池颜色切换逻辑提取为CardBgComp组件，
减少重复代码，提高可维护性

assets/script/game/map/HerosListComp.ts

@@ -25,6 +25,7 @@ import { mLogger } from "../common/Logger";
 import { HeroInfo, HeroList } from "../common/config/heroSet";
 import { buildSkillDesc } from "../common/config/HeroSkillDesc";
 import { CKind } from "../common/config/CardSet";
+import { CardBgComp } from "./CardBgComp";
 import { CardLiteComp } from "./CardLiteComp";
 
 const { property, ccclass } = _decorator;
@@ -212,21 +213,11 @@ export class HerosListComp extends CCComp {
 
     private updatePoolLvBg(poolLv: number) {
         if (!this.BG_node) return
-        const poolColorNames = ["green", "blue", "purple", "yellow", "red"];
-        const poolColorIdx = Math.min(poolLv, 5) - 1;
-        const activeColor = poolColorNames[poolColorIdx];
         const kindName = CKind[CKind.Hero];
         this.BG_node.children.forEach(child => {
             child.active = (child.name === kindName);
-            if (child.active) {
-                child.children.forEach(colorChild => {
-                    colorChild.active = (colorChild.name === activeColor);
-                });
-            } else {
-                child.children.forEach(colorChild => {
-                    colorChild.active = false;
-                });
-            }
+            const bg = child.getComponent(CardBgComp);
+            if (bg) child.active ? bg.apply(poolLv) : bg.clear();
         });
     }