Implement tenant import and RP auto login policies

backend/internal/repository/tenant_repository.go

@@ -3,6 +3,7 @@ package repository
 import (
 	"baron-sso-backend/internal/domain"
 	"context"
+	"errors"
 	"strings"
 	"time"
 
@@ -88,6 +89,20 @@ func (r *tenantRepository) FindByIDs(ctx context.Context, ids []string) ([]domai
 }
 
 func (r *tenantRepository) AddDomain(ctx context.Context, tenantID string, domainName string, verified bool) error {
+	var existing domain.TenantDomain
+	err := r.db.WithContext(ctx).Unscoped().
+		Where("tenant_id = ? AND domain = ?", tenantID, domainName).
+		First(&existing).Error
+	if err == nil {
+		return r.db.WithContext(ctx).Unscoped().Model(&existing).Updates(map[string]any{
+			"verified":   verified,
+			"deleted_at": nil,
+		}).Error
+	}
+	if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return err
+	}
+
 	td := domain.TenantDomain{
 		TenantID: tenantID,
 		Domain:   domainName,