feat(API): optional display name on users

internal/domain/user/userDomain.go

@@ -13,6 +13,7 @@ var ErrVerificationCodeExpired = errors.New("verification code expired")
 var ErrAlreadyVerified = errors.New("user already verified")
 var ErrInvalidPasswordResetCode = errors.New("invalid password reset code")
 var ErrPasswordResetCodeExpired = errors.New("password reset code expired")
+var ErrInvalidDisplayName = errors.New("invalid display name")
 
 type User struct {
 	ID                      uint32    `json:"id"`
@@ -20,6 +21,7 @@ type User struct {
 	Password                string    `json:"password"`
 	PasswordResetCode       string    `json:"password_reset_code"`
 	Email                   string    `json:"email"`
+	DisplayName             string    `json:"display_name"`
 	IsVerified              bool      `json:"is_verified"`
 	VerificationCode        string    `json:"verification_code"`
 	VerificationExpiration  time.Time `json:"verification_expiration"`

internal/domain/user/userRepositoryInterface.go

@@ -14,4 +14,5 @@ type Repository interface {
 	UpdatePasswordResetCode(userId uint32, code string, expiration time.Time) (User, error)
 	ClearVerificationCode(userId uint32) (User, error)
 	ResetPassword(userId uint32, hashedPassword string) (User, error)
+	UpdateDisplayName(userId uint32, displayName string) (User, error)
 }