refactor(HInfoComp): 简化卡牌等级显示逻辑

1. 将lv_node从Node改为Label类型，直接通过string属性更新等级文本
2. 移除原有的子节点遍历匹配逻辑，替换为更简洁的文本赋值方式
3. 新增pool_lv_node节点属性用于后续池等级相关逻辑
4. 同步更新了ha2.prefab的预制体结构与meta配置文件

assets/resources/game/heros/ha2.prefab

@@ -47,13 +47,10 @@
       },
       {
         "__id__": 53
-      },
-      {
-        "__id__": 55
       }
     ],
     "_prefab": {
-      "__id__": 57
+      "__id__": 55
     },
     "_lpos": {
       "__type__": "cc.Vec3",
@@ -898,32 +895,6 @@
     "__type__": "cc.CompPrefabInfo",
     "fileId": "23j+p5lLdC+r4iKSVeLNM4"
   },
-  {
-    "__type__": "cc.Animation",
-    "_name": "",
-    "_objFlags": 0,
-    "__editorExtras__": {},
-    "node": {
-      "__id__": 1
-    },
-    "_enabled": true,
-    "__prefab": {
-      "__id__": 56
-    },
-    "playOnLoad": false,
-    "_clips": [
-      {
-        "__uuid__": "cd3e0604-8840-4794-8755-f2ed86dbe264",
-        "__expectedType__": "cc.AnimationClip"
-      }
-    ],
-    "_defaultClip": null,
-    "_id": ""
-  },
-  {
-    "__type__": "cc.CompPrefabInfo",
-    "fileId": "49+IQe4gZPPYzJ/FgxeX/O"
-  },
   {
     "__type__": "cc.PrefabInfo",
     "root": {

assets/resources/gui/element/pool_lv.prefab.meta

@@ -0,0 +1,13 @@
+{
+  "ver": "1.1.50",
+  "importer": "prefab",
+  "imported": true,
+  "uuid": "bf40528a-fcf8-44da-af2e-d6b113904f35",
+  "files": [
+    ".json"
+  ],
+  "subMetas": {},
+  "userData": {
+    "syncNodeName": "pool_lv"
+  }
+}

assets/script/game/map/HInfoComp.ts

@@ -66,9 +66,11 @@ export class HInfoComp extends CCComp {
     @property(Node)
     info_node=null!
 
-    @property(Node)
-    lv_node=null!
+    @property(Label)
+    lv_node: Label = null!
 
+    @property(Node)
+    pool_lv_node: Node = null!
     @property(Node)
     ap_node=null!
 
@@ -162,12 +164,7 @@ export class HInfoComp extends CCComp {
         // ---- 卡牌等级显示 ----
         if (this.lv_node) {
             const currentLv = this.model.lv ?? 1;
-            this.lv_node.children.forEach(child => {
-                if (child.name.startsWith('lv')) {
-                    const nodeLv = parseInt(child.name.substring(2));
-                    child.active = !isNaN(nodeLv) && nodeLv <= currentLv;
-                }
-            });
+            this.lv_node.string = `Lv.${currentLv}`;
         }
         
         // ---- 图标动画（仅在 UUID 变化时重新加载） ----