feat(card): 添加卡牌等级视觉区分与配置调整

- 在卡牌预制件中新增背景(BG_node)、普通边框(NF_node)和高阶边框(HF_node)节点
- 根据卡牌等级和英雄等级动态显示对应的背景和边框样式
- 调整卡牌等级枚举定义，移除LV6并重命名为CardLV
- 为CardConfig接口添加card_lv字段以支持独立卡牌等级
- 优化buff提示框的布局和字体大小

assets/resources/game/skill/buff/tooltip.prefab

@@ -1782,7 +1782,7 @@
     },
     "_lpos": {
       "__type__": "cc.Vec3",
-      "x": -71.73,
+      "x": -61.45,
       "y": 0.963,
       "z": 0
     },
@@ -1823,8 +1823,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 25.98046875,
-      "height": 81.6
+      "width": 17.6552734375,
+      "height": 56.4
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -1862,7 +1862,7 @@
     "_string": "-",
     "_horizontalAlign": 0,
     "_verticalAlign": 1,
-    "_actualFontSize": 60,
+    "_actualFontSize": 35,
     "_fontSize": 35,
     "_fontFamily": "Arial",
     "_lineHeight": 40,
@@ -1919,7 +1919,7 @@
     },
     "_alignFlags": 8,
     "_target": null,
-    "_left": -34.720234375000004,
+    "_left": -30.557636718750004,
     "_right": 0,
     "_top": 0,
     "_bottom": 0,
@@ -2014,7 +2014,7 @@
     "_overflow": 0,
     "_enableWrapText": true,
     "_font": {
-      "__uuid__": "983a109b-a5e3-4ba7-84c5-1c53817ba177",
+      "__uuid__": "eca7fc51-87d0-4bb0-89e1-aa9c39411bc6",
       "__expectedType__": "cc.BitmapFont"
     },
     "_isSystemFontUsed": false,
@@ -3822,7 +3822,7 @@
     },
     "_lpos": {
       "__type__": "cc.Vec3",
-      "x": -36.930390625,
+      "x": -41.0830078125,
       "y": 0,
       "z": 0
     },
@@ -4011,8 +4011,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 49.31,
-      "height": 50
+      "width": 57.615234375,
+      "height": 65
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -4056,11 +4056,8 @@
     "_lineHeight": 50,
     "_overflow": 0,
     "_enableWrapText": true,
-    "_font": {
-      "__uuid__": "983a109b-a5e3-4ba7-84c5-1c53817ba177",
-      "__expectedType__": "cc.BitmapFont"
-    },
-    "_isSystemFontUsed": false,
+    "_font": null,
+    "_isSystemFontUsed": true,
     "_spacingX": 0,
     "_isItalic": false,
     "_isBold": false,

assets/resources/gui/element/card.prefab

@@ -8650,6 +8650,15 @@
     "Ckind_node": {
       "__id__": 343
     },
+    "BG_node": {
+      "__id__": 2
+    },
+    "NF_node": {
+      "__id__": 118
+    },
+    "HF_node": {
+      "__id__": 172
+    },
     "_id": ""
   },
   {