[DS-8580] Fix ui-next serve router for `/` path (#8748)

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/configuration/AppConfiguration.java

@@ -116,8 +116,8 @@ public class AppConfiguration implements WebMvcConfigurer {
 
     @Override
     public void addViewControllers(ViewControllerRegistry registry) {
+        registry.addViewController("/").setViewName("redirect:/ui/");
         registry.addViewController("/ui/").setViewName("forward:/ui/index.html");
-        registry.addViewController("/").setViewName("forward:/ui/index.html");
     }
 
     /**