Merge branch 'M3-User-Auth' into 'main'

.../fuseri/modulelanguageschool/user/UserRepositoryTest.java

...org/fuseri/modulelanguageschool/user/UserServiceTest.java

application/module-mail/pom.xml

...ain/java/org/fuseri/modulemail/ModuleMailApplication.java

...java/org/fuseri/modulemail/service/AppSecurityConfig.java

...in/java/org/fuseri/modulemail/service/MailController.java

.../main/java/org/fuseri/modulemail/service/MailService.java

...ion/module-mail/src/main/resources/application.properties

...ava/org/fuseri/modulemail/service/MailControllerTest.java

application/pom.xml