feat(任务卡): 允许在英雄满员时通过合并规则使用英雄卡

当英雄数量达到上限时，检查新英雄卡是否符合合并规则。如果满足相同英雄和等级的数量要求，则允许使用该卡进行合并升级，避免因上限限制而无法使用英雄卡。

assets/script/game/map/MissionCardComp.ts

@@ -13,6 +13,7 @@ import { HeroInfo, HType } from "../common/config/heroSet";
 import { HeroViewComp } from "../hero/HeroViewComp";
 import { FacSet } from "../common/config/GameSet";
 import { MoveComp } from "../hero/MoveComp";
+import { MissionHeroCompComp } from "./MissionHeroComp";
 
 const { ccclass, property } = _decorator;
 
@@ -231,6 +232,13 @@ export class MissionCardComp extends CCComp {
         this.syncMissionHeroData(current);
         const heroMax = this.getMissionHeroMaxNum();
         if (current >= heroMax) {
+            const heroUuid = Number(payload?.uuid ?? 0);
+            const heroLv = Math.max(1, Math.floor(Number(payload?.hero_lv ?? 1)));
+            if (this.canUseHeroCardByMerge(heroUuid, heroLv)) {
+                payload.cancel = false;
+                payload.reason = "";
+                return;
+            }
             payload.cancel = true;
             payload.reason = "hero_limit";
             oops.gui.toast(`英雄已满 (${current}/${heroMax})`);
@@ -238,6 +246,39 @@ export class MissionCardComp extends CCComp {
         }
     }
 
+    private canUseHeroCardByMerge(heroUuid: number, heroLv: number): boolean {
+        if (!heroUuid) return false;
+        const mergeRule = this.getMergeRule();
+        if (heroLv >= mergeRule.maxLv) return false;
+        const sameCount = this.countAliveHeroesByUuidAndLv(heroUuid, heroLv);
+        return sameCount + 1 >= mergeRule.needCount;
+    }
+
+    private countAliveHeroesByUuidAndLv(heroUuid: number, heroLv: number): number {
+        let count = 0;
+        const actors = this.queryAliveHeroActors();
+        for (let i = 0; i < actors.length; i++) {
+            const model = actors[i].model;
+            if (!model) continue;
+            if (model.hero_uuid !== heroUuid) continue;
+            if (model.lv !== heroLv) continue;
+            count += 1;
+        }
+        return count;
+    }
+
+    private getMergeRule(): { needCount: number, maxLv: number } {
+        let needCount = 2;
+        let maxLv = 3;
+        ecs.query(ecs.allOf(MissionHeroCompComp)).forEach((entity: ecs.Entity) => {
+            const comp = entity.get(MissionHeroCompComp);
+            if (!comp) return;
+            needCount = comp.merge_need_count === 2 ? 2 : 3;
+            maxLv = Math.max(1, Math.floor(comp.merge_max_lv ?? 3));
+        });
+        return { needCount, maxLv };
+    }
+
     private onUseSpecialCard(event: string, args: any) {
         const payload = args ?? event;
         const uuid = Number(payload?.uuid ?? 0);