refactor(ui): 移除卡牌槽组件CardComp及关联资源

1.  移除了CardComp.ts主文件和对应的prefab、meta配置文件
2.  更新了GameEvent.ts中的事件注释，修正了CardSelected和CardUsed的载荷类型描述

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

@@ -1,13 +0,0 @@
-{
-  "ver": "1.1.50",
-  "importer": "prefab",
-  "imported": true,
-  "uuid": "8aaff904-8c27-4173-9716-7161893b336e",
-  "files": [
-    ".json"
-  ],
-  "subMetas": {},
-  "userData": {
-    "syncNodeName": "card"
-  }
-}