feat(talent): 重构天赋升级交互，新增确认弹窗逻辑

1.  移除天赋预制件上的+号节点和旧的背景组件，改为按阶位切换颜色背景
2.  天赋点击逻辑改为先弹出确认弹窗再执行升级
3.  简化天赋项组件的参数传递和状态判断逻辑
4.  更新注释文档与组件职责描述

assets/resources/gui/element/prefab_talent_item.prefab

@@ -2151,13 +2151,10 @@
     "bg": {
       "__id__": 2
     },
-    "node_plus": null,
     "node_max": {
       "__id__": 70
     },
-    "node_lock": {
-      "__id__": 64
-    },
+    "node_lock": null,
     "_id": ""
   },
   {