Return the created location from CreateTenantLocation so its locationid is available immediately

The store/branch QR code the app scans is just {tenantid, locationid} JSON, but the
onboarding response previously discarded the DB-assigned locationid, so the frontend
had no way to render a store's QR right after onboarding without a separate lookup.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

repositories/tenantRepository.go

@@ -25,7 +25,7 @@ type TenantRepository interface {
 	GetStaffs(tid int) ([]models.StaffInfo, error)
 	CreateStaff(user models.User) error
 	UpdateStaff(user models.User) error
-	CreateTenantLocation(data models.Tenantlocations) error
+	CreateTenantLocation(data models.Tenantlocations) (models.Tenantlocations, error)
 	UpdateTenantLocation(data models.Tenantlocations) error
 	CheckTenantByNo(cno string) int
 	CreateTenantUser(data models.Tenants) (bool, error)
@@ -346,7 +346,7 @@ func (r *tenantRepository) UpdateStaff(user models.User) error {
 	return nil
 }
 
-func (r *tenantRepository) CreateTenantLocation(data models.Tenantlocations) error {
+func (r *tenantRepository) CreateTenantLocation(data models.Tenantlocations) (models.Tenantlocations, error) {
 	var user models.Tenantuser
 	tx := r.db.Begin()
 
@@ -360,10 +360,12 @@ func (r *tenantRepository) CreateTenantLocation(data models.Tenantlocations) err
 		data.Status = "Active"
 	}
 
-	// Step 1: Insert into tenantlocations
+	// Step 1: Insert into tenantlocations. GORM writes the DB-assigned
+	// locationid back onto data, which callers need to build the store's
+	// QR code (payload is just {tenantid, locationid}) right after onboarding.
 	if err := tx.Create(&data).Error; err != nil {
 		tx.Rollback()
-		return err
+		return models.Tenantlocations{}, err
 	}
 
 	// Step 2: Insert into app_users
@@ -389,15 +391,15 @@ func (r *tenantRepository) CreateTenantLocation(data models.Tenantlocations) err
 
 	if err := tx.Table("app_users").Create(&user).Error; err != nil {
 		tx.Rollback()
-		return err
+		return models.Tenantlocations{}, err
 	}
 
 	// Commit
 	if err := tx.Commit().Error; err != nil {
-		return err
+		return models.Tenantlocations{}, err
 	}
 
-	return nil
+	return data, nil
 }
 
 func (r *tenantRepository) UpdateTenantLocation(input models.Tenantlocations) error {