feat: add user_tenant associations

backend/app/services/user.go

@@ -16,7 +16,7 @@ type user struct{}
 func (t *user) FindByID(ctx context.Context, userID int64) (*models.User, error) {
 	tbl, query := models.UserQuery.QueryContext(ctx)
 
-	model, err := query.Where(tbl.ID.Eq(userID)).First()
+	model, err := query.Preload(tbl.OwnedTenant, tbl.Tenants).Where(tbl.ID.Eq(userID)).First()
 	if err != nil {
 		return nil, errors.Wrapf(err, "FindByID failed, %d", userID)
 	}