feat: 添加 SpotlightOverlay 组件，更新引导步骤组件以支持高亮功能，调整样式和路由配置

src/components/Guide/index.ts

@@ -2,6 +2,7 @@
 export { default as GuideDragon } from './GuideDragon.vue'
 export { default as GuideSteps } from './GuideSteps.vue'
 export { default as GuideStepsItem } from './GuideStepsItem.vue'
+export { default as SpotlightOverlay } from './SpotlightOverlay.vue'
 
 // 类型导出
 export type {