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/resources/game/map/map_rpg.prefab

@@ -8218,7 +8218,7 @@
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   {
     "__type__": "cc.Node",
-    "_name": "LINE2",
+    "_name": "BOSS",
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@@ -8289,7 +8289,7 @@
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@@ -8299,14 +8299,14 @@
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   },
   {
     "__type__": "cc.Node",
-    "_name": "HERO",
+    "_name": "MON",
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     "_parent": {
@@ -8377,7 +8377,7 @@
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@@ -8387,14 +8387,14 @@
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@@ -8465,7 +8465,7 @@
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@@ -8475,14 +8475,14 @@
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@@ -8553,7 +8553,7 @@
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@@ -8563,14 +8563,14 @@
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-    "_name": "BOOS",
+    "_name": "LINE3",
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     "_parent": {
@@ -8641,7 +8641,7 @@
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@@ -8651,7 +8651,7 @@
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