feat(英雄合并): 添加合并时的爆炸特效

在英雄合并完成后播放视觉特效，提升合并操作的反馈和表现力。使用预制体资源并确保在正确的层级上显示。

assets/script/game/map/MissionHeroComp.ts

@@ -1,4 +1,4 @@
-import { _decorator, v3, Vec3 } from "cc";
+import { _decorator, instantiate, Prefab, v3, Vec3 } from "cc";
 import { ecs } from "../../../../extensions/oops-plugin-framework/assets/libs/ecs/ECS";
 import { CCComp } from "../../../../extensions/oops-plugin-framework/assets/module/common/CCComp";
 import { Hero } from "../hero/Hero";
@@ -9,6 +9,7 @@ import { HeroPos } from "../common/config/heroSet";
 import { oops } from "../../../../extensions/oops-plugin-framework/assets/core/Oops";
 import { HeroAttrsComp } from "../hero/HeroAttrsComp";
 import { FacSet } from "../common/config/GameSet";
+import { oneCom } from "../skill/oncend";
 const { ccclass } = _decorator;
 
 /** 视图层对象 */
@@ -77,6 +78,7 @@ export class MissionHeroCompComp extends CCComp {
                 const landingPos:Vec3 = HeroPos[hero_pos].pos;
                 const spawnPos:Vec3 = v3(landingPos.x, landingPos.y + MissionHeroCompComp.HERO_DROP_HEIGHT, 0);
                 await this.mergeDestroyAtBirth(mergeHeroes, spawnPos);
+                await this.playMergeBoomFx(spawnPos);
                 this.addMergedHero(uuid, hero_lv + 1, sumAp, sumHpMax);
             } finally {
                 this.is_merging = false;
@@ -152,6 +154,31 @@ export class MissionHeroCompComp extends CCComp {
         });
     }
 
+    private playMergeBoomFx(worldPos: Vec3): Promise<void> {
+        return new Promise((resolve) => {
+            const scene = smc.map?.MapView?.scene;
+            const layer = scene?.entityLayer?.node;
+            if (!layer || !layer.isValid) {
+                resolve();
+                return;
+            }
+            const prefab: Prefab = oops.res.get("game/skill/end/dead", Prefab)!;
+            if (!prefab) {
+                resolve();
+                return;
+            }
+            const fx = instantiate(prefab);
+            if (!fx || !fx.isValid) {
+                resolve();
+                return;
+            }
+            fx.parent = layer;
+            fx.setPosition(worldPos);
+            fx.getComponent(oneCom) || fx.addComponent(oneCom);
+            this.scheduleOnce(() => resolve(), 0.4);
+        });
+    }
+