refactor: Modular inbounds/outbounds

adapter/outbound.go

@@ -1,6 +1,10 @@
 package adapter
 
 import (
+	"context"
+
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
 	N "github.com/sagernet/sing/common/network"
 )
 
@@ -13,3 +17,8 @@ type Outbound interface {
 	Dependencies() []string
 	N.Dialer
 }
+
+type OutboundRegistry interface {
+	option.OutboundOptionsRegistry
+	CreateOutbound(ctx context.Context, router Router, logger log.ContextLogger, tag string, outboundType string, options any) (Outbound, error)
+}