重构(任务配置): 提取波次金币奖励配置到 FightSet 枚举

将 MissionComp 中原硬编码的波次金币相关常量，迁移至集中定义的 FightSet 枚举中，统一配置管理以提升后续维护便利性。

assets/script/game/map/MissionComp.ts

@@ -88,12 +88,6 @@ export class MissionComp extends CCComp {
     private maxMonsterCount: number = 80;
     /** 怪物数量恢复阈值（降至此值以下恢复刷怪） */
     private resumeMonsterCount: number = 45;
-    /** 新一波金币奖励基础值 */
-    private prepareBaseCoinReward: number = 4;
-    /** 每一波金币增长值（公式: base + (wave-1) * growth） */
-    private prepareCoinWaveGrow: number = 1;
-    /** 金币奖励上限（固定收益上限） */
-    private prepareMaxCoinReward: number = 10;
     /** 卡池升级波次配置：达到对应波次时，推送卡池升级事件 */
     @property({ type: [CCInteger], tooltip: "卡池升级波次配置，例如 [10, 20] 表示第10波升到2级，第20波升到3级" })
     cardPoolUpgradeWaves: number[] = [5, 10];
@@ -803,8 +797,8 @@ export class MissionComp extends CCComp {
         if (wave <= this.lastPrepareCoinWave) return;
 
         // 波次金币公式: baseReward + (wave-1) * waveGrow，且不超过 prepareMaxCoinReward
-        const calculatedReward = this.prepareBaseCoinReward + (wave - 1) * this.prepareCoinWaveGrow;
-        const waveReward = Math.min(this.prepareMaxCoinReward, calculatedReward);
+        const calculatedReward = FightSet.WAVE_COIN_BASE + (wave - 1) * FightSet.WAVE_COIN_GROW;
+        const waveReward = Math.min(FightSet.WAVE_COIN_MAX, calculatedReward);
         const reward = MissionEconomy.executeWaveGold(waveReward);
 
         this.lastPrepareCoinWave = wave;