merge ss and ssu

pkg/handler/handler.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"net"
 
+	"github.com/go-gost/gost/pkg/chain"
 	"github.com/go-gost/gost/pkg/metadata"
 )
 
@@ -11,3 +12,7 @@ type Handler interface {
 	Init(metadata.Metadata) error
 	Handle(context.Context, net.Conn)
 }
+
+type Forwarder interface {
+	Forward(*chain.NodeGroup)
+}