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/EquipListComp.ts

@@ -21,7 +21,6 @@ import { buildEquipRich } from "../common/config/HeroSkillDesc";
 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;
 
@@ -327,19 +326,7 @@ export class EquipListComp 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, "EquipListComp", "purchase failed: not enough coin", {
-                uuid: this.cardData.uuid,
-                cost
-            });
-            return;
-        }
-
-        // 派发 UseEquipCard，装备生效流程由 MissEquipComp 接收处理
+        // 购买不花费金币（免费获取），直接派发装备生效事件
         oops.message.dispatchEvent(GameEvent.UseEquipCard, this.cardData);
 
         // 播放购买动画（卡牌放大 + 淡出）
@@ -350,8 +337,7 @@ export class EquipListComp extends CCComp {
         oops.message.dispatchEvent(GameEvent.CardUsed, this);
 
         mLogger.log(this.debugMode, "EquipListComp", "equipment purchased", {
-            uuid: this.cardData.uuid,
-            cost
+            uuid: this.cardData.uuid
         });
     }