update 优化 修改类名 避免无用扫描

ruoyi-modules/ruoyi-demo/src/main/java/org/dromara/demo/controller/MailController.java → ruoyi-modules/ruoyi-demo/src/main/java/org/dromara/demo/controller/MailSendController.java

@@ -21,7 +21,7 @@ import java.util.Arrays;
 @RequiredArgsConstructor
 @RestController
 @RequestMapping("/demo/mail")
-public class MailController {
+public class MailSendController {
 
     /**
      * 发送邮件