refactor: 移除驻场技能的折扣与收益加成逻辑

1.  删除所有与BuyDiscount、RefreshDiscount、SellGold、WaveGold相关的技能配置与代码逻辑
2.  简化卡牌购买价格、出售价格、刷新费用和回合金币收益的计算逻辑，不再依赖驻场技能加成
3.  更新英雄盒子的出售价格注释，移除驻场加成说明

assets/script/game/map/CardComp.ts

@@ -33,8 +33,6 @@ import { smc } from "../common/SingletonModuleComp";
 
 import { UIID } from "../common/config/GameUIConfig";
 import { HeroAttrsComp } from "../hero/HeroAttrsComp";
-import { FieldSkillType } from "../common/config/SkillSet";
-import { FieldSkillHelper } from "../hero/FieldSkillHelper";
 import { MissionEconomy } from "./MissionEconomy";
 
 
@@ -255,13 +253,7 @@ export class CardComp extends CCComp {
         this.card_uuid = data.uuid;
         this.card_type = data.type;
 
-        let baseCost = data.cost ?? 0;
-        if (this.card_type === CardType.Hero) {
-            // 驻场英雄带来的"购买优惠"折扣
-            const discount = FieldSkillHelper.getFieldSkillTotalValue(FieldSkillType.BuyDiscount);
-            baseCost = Math.max(0, baseCost - discount);
-        }
-        this.card_cost = Math.floor(baseCost);
+        this.card_cost = Math.floor(data.cost ?? 0);
 
         this.node.active = true;
         this.applyCardUI();