[REFACTOR] Clean up code formatting and improve import statements across multiple classes

...m/safetypin/authentication/AuthenticationApplication.java

...java/com/safetypin/authentication/config/AsyncConfig.java

...n/authentication/controller/AuthenticationController.java

...n/java/com/safetypin/authentication/dto/AuthResponse.java

.../java/com/safetypin/authentication/dto/ErrorResponse.java

...n/java/com/safetypin/authentication/dto/UserResponse.java

src/main/java/com/safetypin/authentication/model/User.java

...m/safetypin/authentication/repository/UserRepository.java

...java/com/safetypin/authentication/service/OTPService.java

...etypin/authentication/AuthenticationApplicationTests.java

...ava/com/safetypin/authentication/HelloControllerTest.java

.../com/safetypin/authentication/config/AsyncConfigTest.java

...a/com/safetypin/authentication/dto/ErrorResponseTest.java

...afetypin/authentication/dto/PasswordResetRequestTest.java

...safetypin/authentication/dto/RegistrationRequestTest.java

.../safetypin/authentication/dto/SocialLoginRequestTest.java

...est/java/com/safetypin/authentication/model/RoleTest.java

...est/java/com/safetypin/authentication/model/UserTest.java

...fetypin/authentication/repository/UserRepositoryTest.java

...om/safetypin/authentication/service/EmailServiceTest.java