add service

pkg/validation/validation.go

@@ -83,7 +83,7 @@ func ValidatePassword(password string) error {
 
 func ValidatePhone(phone string) error {
 	if phone == "" {
-		return errors.NewBusinessError(errors.ValidationInvalidPhone, "phone is required")
+		return nil
 	}
 
 	if len(phone) > MaxPhoneLength {

pkg/validation/validation_test.go

@@ -87,7 +87,7 @@ func TestValidatePhone(t *testing.T) {
 		{"valid international", "+1234567890", false, ""},
 		{"valid with country code", "+79123456789", false, ""},
 		{"valid without plus", "1234567890", false, ""},
-		{"empty", "", true, errors.ValidationInvalidPhone},
+		{"empty is valid", "", false, ""},
 		{"too short", "123", true, errors.ValidationInvalidPhone},
 		{"letters", "abcdefgh", true, errors.ValidationInvalidPhone},
 		{"too long", "+123456789012345678901", true, errors.ValidationInvalidPhone},
@@ -203,6 +203,7 @@ func TestValidateRegistration(t *testing.T) {
 		wantErr  bool
 	}{
 		{"valid", "test@example.com", "Abcd1234", "John Doe", "+1234567890", false},
+		{"valid without phone", "test@example.com", "Abcd1234", "John Doe", "", false},
 		{"invalid email", "invalid", "Abcd1234", "John Doe", "+1234567890", true},
 		{"invalid password", "test@example.com", "weak", "John Doe", "+1234567890", true},
 		{"invalid name", "test@example.com", "Abcd1234", "", "+1234567890", true},