refactor(monster): 重构怪物分层显示与战斗逻辑

1.  重构怪物挂载逻辑，按Boss/小怪分别挂载到对应场景层
2.  调整怪物出生落点逻辑，移除额外Y轴偏移
3.  优化场景节点清理范围，新增MON/BOSS层清理
4.  重构渲染排序逻辑，分层管理怪物渲染层级
5.  新增5套攻击技能预制体与动画资源
6.  修复技能配置参数冗余注释与类型错误

assets/script/game/map/MissionComp.ts

@@ -1005,21 +1005,17 @@ export class MissionComp extends CCComp {
         this.clearBattleSceneNodes();
     }
 
-    /** 清理战斗场景中的 HERO 和 SKILL 根节点下的所有子节点 */
+    /** 清理战斗场景中的 HERO/MON/BOSS 和 SKILL 根节点下的所有子节点 */
     private clearBattleSceneNodes() {
         const scene = smc.map?.MapView?.scene;
         const layer = scene?.entityLayer?.node;
         if (!layer) return;
-        const heroRoot = layer.getChildByName("HERO");
-        const skillRoot = layer.getChildByName("SKILL");
-        if (heroRoot) {
-            for (let i = heroRoot.children.length - 1; i >= 0; i--) {
-                heroRoot.children[i].destroy();
-            }
-        }
-        if (skillRoot) {
-            for (let i = skillRoot.children.length - 1; i >= 0; i--) {
-                skillRoot.children[i].destroy();
+        for (const name of ["HERO", "MON", "BOSS", "SKILL"]) {
+            const root = layer.getChildByName(name);
+            if (root) {
+                for (let i = root.children.length - 1; i >= 0; i--) {
+                    root.children[i].destroy();
+                }
             }
         }
     }

assets/script/game/map/MissionMonComp.ts

@@ -142,7 +142,7 @@ export class MissionMonCompComp extends CCComp {
         const spawnX = MissionMonCompComp.SPAWN_X_MIN
             + (MissionMonCompComp.SPAWN_X_MAX - MissionMonCompComp.SPAWN_X_MIN)
             * (posIndex / Math.max(1, BOSS_COUNT + MINION_COUNT - 1));
-        const landingY = basePos.y + (monData.isBoss ? 6 : 0);
+        const landingY = basePos.y;
         const spawnPos: Vec3 = v3(spawnX, landingY + MissionMonCompComp.MON_DROP_HEIGHT, 0);
         this.globalSpawnOrder = (this.globalSpawnOrder + 1) % 999;