feat: complete email verification flow

domain/gateways/IUserRepository.go

@@ -7,5 +7,6 @@ type IUserRepository interface {
 	GetByUsername(username string) (user.User, error)
 	GetAll() []user.User
 	Create(user user.User) (user.User, error)
+	Delete(id uint32) error
 	UpdateVerificationStatus(userId uint32, isVerified bool) (user.User, error)
 }