refactor: project name and set default plan for new user

internal/services/auth/register_user.go

@@ -15,13 +15,18 @@ func (a *AuthSvc) RegisterUser(spec authdomain.RegisterUserReq) (string, error)
 		return "", errors.New("this email address is already in use")
 	}
 
-	var subsId string
-
-	if spec.SubscribePlanID != "" {
-		subsId, err = a.subsRepo.Create(spec.SubscribePlanID)
+	if spec.SubscribePlanID == "" {
+		subsPlan, err := a.subsPlanRepo.GetDefault()
 		if err != nil {
-			return "", nil
+			return "", err
 		}
+
+		spec.SubscribePlanID = subsPlan.ID
+	}
+
+	subsId, err := a.subsRepo.Create(spec.SubscribePlanID)
+	if err != nil {
+		return "", nil
 	}
 
 	hashedPwd, err := HashPassword(spec.Password)
@@ -30,7 +35,7 @@ func (a *AuthSvc) RegisterUser(spec authdomain.RegisterUserReq) (string, error)
 	}
 
 	user := authdomain.User{
-		ID:          uuid.New(),
+		ID:          uuid.NewString(),
 		Email:       spec.Email,
 		SubscribeID: subsId,
 		Password:    hashedPwd,