feat(skillBox): 添加技能跨波次维持功能

1. 新增keep_waves配置字段控制技能维持波次
2. 重构技能盒组件的波次切换逻辑，支持跨波次持续生效
3. 为默认技能卡添加15波次的维持配置
4. 优化节点销毁的合法性校验逻辑

assets/resources/gui/element/MSkillBox.prefab

@@ -38,13 +38,10 @@
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@@ -2941,42 +2938,6 @@
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-    "node": {
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-    "card1": {
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-    "card2": {
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-    "card3": {
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@@ -2987,7 +2948,7 @@
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     "_enabled": true,
     "__prefab": {
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