refactor(map): 移除所有卡牌购买的扣费逻辑，改为免费获取

统一调整四个卡牌组件的购买流程，删除MissionEconomy导入和扣费校验代码，更新注释说明当前为免费购买模式，简化日志输出内容

assets/script/game/map/ItemListComp.ts

@@ -23,7 +23,6 @@ import { buildCardDescRich, buildEquipRich } from "../common/config/HeroSkillDes
 import { oops } from "db://oops-framework/core/Oops";
 import { getCardIconId, setSpriteFrame } from "../common/CardIconHelper";
 import { GameEvent } from "../common/config/GameEvent";
-import { MissionEconomy } from "./MissionEconomy";
 
 const { ccclass, property } = _decorator;
 
@@ -340,19 +339,7 @@ export class ItemListComp extends CCComp {
 
         oops.audio.playEffect("music/button");
 
-        // 扣费
-        const cost = this.cardData.cost ?? 0;
-        const success = MissionEconomy.spendCoin(cost);
-        if (!success) {
-            oops.message.dispatchEvent(GameEvent.ShowSmallTip, "buy_coin");
-            mLogger.log(this.debugMode, "ItemListComp", "purchase failed: not enough coin", {
-                uuid: this.cardData.uuid,
-                cost
-            });
-            return;
-        }
-
-        // 根据类型派发对应事件
+        // 购买不花费金币（免费获取），直接根据类型派发对应事件
         const isEquip = this.cardData.trigger_type === CardTriggerType.Field;
         const isPotion = this.cardData.kind === CKind.Potion;
 
@@ -360,23 +347,20 @@ export class ItemListComp extends CCComp {
             // 装备：被动驻场，由 MissEquipComp 处理
             oops.message.dispatchEvent(GameEvent.UseEquipCard, this.cardData);
             mLogger.log(this.debugMode, "ItemListComp", "equipment purchased", {
-                uuid: this.cardData.uuid,
-                cost
+                uuid: this.cardData.uuid
             });
         } else if (isPotion) {
             // 商品/药品：一次性 buff 技能，由 MissSkillsComp 处理
             oops.message.dispatchEvent(GameEvent.UseItemCard, this.cardData);
             mLogger.log(this.debugMode, "ItemListComp", "item purchased", {
                 uuid: this.cardData.uuid,
-                skill: this.cardData.skill,
-                cost
+                skill: this.cardData.skill
             });
         } else {
             // 默认走技能卡流程
             oops.message.dispatchEvent(GameEvent.UseSkillCard, this.cardData);
             mLogger.log(this.debugMode, "ItemListComp", "card purchased", {
-                uuid: this.cardData.uuid,
-                cost
+                uuid: this.cardData.uuid
             });
         }