add function to s3

backend/internal/system/service.go

@@ -648,6 +648,40 @@ func (s *Service) ListNetworkInterfaces(ctx context.Context) ([]NetworkInterface
 	return interfaces, nil
 }
 
+// GetManagementIPAddress returns the IP address of the management interface
+func (s *Service) GetManagementIPAddress(ctx context.Context) (string, error) {
+	interfaces, err := s.ListNetworkInterfaces(ctx)
+	if err != nil {
+		return "", fmt.Errorf("failed to list network interfaces: %w", err)
+	}
+
+	// First, try to find interface with Role "Management"
+	for _, iface := range interfaces {
+		if iface.Role == "Management" && iface.IPAddress != "" && iface.Status == "Connected" {
+			s.logger.Info("Found management interface", "interface", iface.Name, "ip", iface.IPAddress)
+			return iface.IPAddress, nil
+		}
+	}
+
+	// Fallback: use interface with default route (primary interface)
+	for _, iface := range interfaces {
+		if iface.Gateway != "" && iface.IPAddress != "" && iface.Status == "Connected" {
+			s.logger.Info("Using primary interface as management", "interface", iface.Name, "ip", iface.IPAddress)
+			return iface.IPAddress, nil
+		}
+	}
+
+	// Final fallback: use first connected interface with IP
+	for _, iface := range interfaces {
+		if iface.IPAddress != "" && iface.Status == "Connected" && iface.Name != "lo" {
+			s.logger.Info("Using first connected interface as management", "interface", iface.Name, "ip", iface.IPAddress)
+			return iface.IPAddress, nil
+		}
+	}
+
+	return "", fmt.Errorf("no management interface found")
+}
+
 // UpdateNetworkInterfaceRequest represents the request to update a network interface
 type UpdateNetworkInterfaceRequest struct {
 	IPAddress string `json:"ip_address"`