style: apply backend go fmt and frontend biome auto-fixes

backend/internal/handler/user_handler.go

@@ -579,7 +579,7 @@ func (h *UserHandler) BulkCreateUsers(c *fiber.Ctx) error {
 		finalLoginID := extractTraitString(attributes, "id")
 		userEmail := email
 		userPhone := normalizePhoneNumber(item.Phone)
-		
+
 		if err := domain.ValidateLoginID(finalLoginID, userEmail, userPhone); err != nil {
 			results = append(results, bulkUserResult{Email: email, Success: false, Message: err.Error()})
 			continue