fix: 调整部分定位组件的z-index层级

element plus 的 v-loading 遮罩层默认 z-index 为 2000
导致会遮挡住框架部分组件

src/layouts/components/Search/index.vue

@@ -286,7 +286,7 @@ function pageJump(url: string) {
 <style lang="scss" scoped>
 #search {
   position: fixed;
-  z-index: 2000;
+  z-index: 4000;
   top: 0;
   left: 0;
   width: 100%;

src/layouts/components/Topbar/index.vue

@@ -73,7 +73,7 @@ function pathCompile(path: string) {
 <style lang="scss" scoped>
 .topbar-container {
   position: absolute;
-  z-index: 999;
+  z-index: 3000;
   top: 0;
   display: flex;
   align-items: center;