fix: Api server startup fail (#2198)

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/ApiApplicationServer.java

@@ -25,7 +25,9 @@ import springfox.documentation.swagger2.annotations.EnableSwagger2;
 
 @SpringBootApplication
 @ServletComponentScan
-@ComponentScan("org.apache.dolphinscheduler")
+@ComponentScan({"org.apache.dolphinscheduler.api",
+        "org.apache.dolphinscheduler.dao",
+        "org.apache.dolphinscheduler.service"})
 public class ApiApplicationServer extends SpringBootServletInitializer {
 
   public static void main(String[] args) {