feat(game): 重构卡牌技能关联逻辑，调整游戏UI布局

为CardConfig新增skill字段，支持卡牌独立关联技能UUID
重构SCardComp与SkillBoxComp的技能获取逻辑，修复技能图标与配置读取问题，修正组件参数注释
调整GameSet中的游戏地平线坐标，优化多个场景与UI预制体的布局位置
移除部分预制体中的冗余配置项，清理无效代码

assets/resources/gui/element/mission.prefab

@@ -14302,7 +14302,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 761.798,
-      "y": 969.971,
+      "y": 640,
       "z": 0
     },
     "_lrot": {
@@ -14903,11 +14903,11 @@
     "__prefab": {
       "__id__": 701
     },
-    "_alignFlags": 1,
+    "_alignFlags": 2,
     "_target": null,
     "_left": 0,
     "_right": 0,
-    "_top": 250.0290000000001,
+    "_top": 448.34799999999996,
     "_bottom": 0,
     "_horizontalCenter": 0,
     "_verticalCenter": 0,