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/MissionEconomy.ts

@@ -2,8 +2,6 @@ import { smc } from "../common/SingletonModuleComp";
 import { oops } from "../../../../extensions/oops-plugin-framework/assets/core/Oops";
 import { GameEvent } from "../common/config/GameEvent";
 import { FightSet } from "../common/config/GameSet";
-import { FieldSkillType } from "../common/config/SkillSet";
-import { FieldSkillHelper } from "../hero/FieldSkillHelper";
 
 /**
  * 局内经济统一管理类
@@ -46,11 +44,7 @@ export class MissionEconomy {
      * @param baseCost 基础费用，默认为1
      */
     static getRefreshCost(baseCost: number = 1): number {
-        let cost = baseCost;
-        // 驻场英雄带来的"刷新优惠"折扣
-        const discount = FieldSkillHelper.getFieldSkillTotalValue(FieldSkillType.RefreshDiscount);
-        cost = Math.max(0, cost - discount);
-        return Math.floor(cost);
+        return Math.floor(Math.max(0, baseCost));
     }
 
     /** 获取当前刷新石数量 */
@@ -135,11 +129,7 @@ export class MissionEconomy {
         const lv = Math.max(1, Math.floor(heroLevel));
         // 基础出售价 3（保底招募残值）+ 累计升级投入的 50%
         const investTotal = 5 * (Math.pow(2, lv - 1) - 1);
-        const baseSellGold = 3 + Math.floor(investTotal * 0.5);
-        // 驻场英雄带来的"出售金币"加成（包含原 SellBonus 语义，统一在 SellGold 中）
-        const goldBoost = FieldSkillHelper.getFieldSkillTotalValue(FieldSkillType.SellGold);
-        const totalSellGold = baseSellGold + goldBoost;
-        return Math.floor(totalSellGold);
+        return Math.floor(3 + Math.floor(investTotal * 0.5));
     }
 
     /**
@@ -155,10 +145,7 @@ export class MissionEconomy {
      * 计算每回合基础金币收益 
      */
     static getWaveGold(baseReward: number): number {
-        let reward = Math.max(0, Math.floor(baseReward));
-        const goldBoost = FieldSkillHelper.getFieldSkillTotalValue(FieldSkillType.WaveGold);
-        reward += goldBoost;
-        return reward;
+        return Math.max(0, Math.floor(baseReward));
     }
 
     /**