refactor(map): 优化英雄列表排序和英雄等级展示逻辑

1. 新增英雄列表按pool_lv升序排序的逻辑
2. 从cardData中获取英雄等级替代直接读取HeroInfo，优化数据读取方式

assets/script/game/map/HerosListComp.ts

@@ -115,7 +115,11 @@ export class HerosListComp extends CCComp {
 
         this.cards_node.removeAllChildren()
 
-        for (const uuid of HeroList) {
+        const sorted = [...HeroList].sort((a, b) => {
+            return (HeroInfo[a]?.pool_lv ?? 1) - (HeroInfo[b]?.pool_lv ?? 1);
+        });
+
+        for (const uuid of sorted) {
             const hero = HeroInfo[uuid]
             if (!hero) continue