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>

services/tenantService.go

@@ -107,7 +107,7 @@ func (s *tenantService) UpdateStaff(user models.User) error {
 }
 
 func (s *tenantService) CreateTenantLocation(data models.Tenantlocations) map[string]interface{} {
-	err := s.repo.CreateTenantLocation(data)
+	created, err := s.repo.CreateTenantLocation(data)
 	if err != nil {
 		return map[string]interface{}{
 			"code":    http.StatusConflict,
@@ -116,10 +116,14 @@ func (s *tenantService) CreateTenantLocation(data models.Tenantlocations) map[st
 		}
 	}
 
+	// "details" carries back the DB-assigned locationid so the frontend can
+	// build the store's QR code (tenantid+locationid) immediately after
+	// onboarding, instead of having to look the new location up separately.
 	return map[string]interface{}{
 		"code":    http.StatusCreated,
 		"message": "Tenant Location Successfully Created",
 		"status":  true,
+		"details": created,
 	}
 }