fixed windows build and build windows version

internal/usbip/server_windows.go

@@ -0,0 +1,47 @@
+//go:build windows
+
+package usbip
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/duffy/usb-server/internal/usb"
+)
+
+// Server is a stub on Windows - USB/IP server requires Linux usbdevfs.
+type Server struct{}
+
+func NewServer(dev *usb.Device) *Server {
+	return &Server{}
+}
+
+func (s *Server) Attach() error {
+	return fmt.Errorf("USB/IP server not supported on Windows")
+}
+
+func (s *Server) Detach() {}
+
+func (s *Server) BuildDeviceDescriptor() DeviceDescriptor {
+	return DeviceDescriptor{}
+}
+
+func (s *Server) BuildInterfaceDescriptors() []InterfaceDescriptor {
+	return nil
+}
+
+func (s *Server) HandleConnection(r io.Reader, w io.Writer) error {
+	return fmt.Errorf("USB/IP server not supported on Windows")
+}
+
+func (s *Server) HandleDevlistRequest() ([]byte, error) {
+	return nil, fmt.Errorf("USB/IP server not supported on Windows")
+}
+
+func (s *Server) HandleImportRequest(requestedBusID string) ([]byte, error) {
+	return nil, fmt.Errorf("USB/IP server not supported on Windows")
+}
+
+func (s *Server) ReadManagementRequest(r io.Reader) (response []byte, startTransfer bool, err error) {
+	return nil, false, fmt.Errorf("USB/IP server not supported on Windows")
+}

internal/usbip/vhci_windows.go

@@ -0,0 +1,21 @@
+//go:build windows
+
+package usbip
+
+import "fmt"
+
+func IsVHCIAvailable() bool {
+	return false
+}
+
+func FindFreePort(speed uint32) (int, error) {
+	return -1, fmt.Errorf("VHCI not supported on Windows")
+}
+
+func AttachDevice(port int, sockfd int, devID uint32, speed uint32) error {
+	return fmt.Errorf("VHCI not supported on Windows")
+}
+
+func DetachDevice(port int) error {
+	return fmt.Errorf("VHCI not supported on Windows")
+}