Integrate relay into peer conn

- extend mgm with relay address
- extend signaling with remote peer's relay address
- start setup relay connection before engine start

client/internal/wgproxy/factory_linux.go

@@ -4,20 +4,10 @@ package wgproxy
 
 import (
 	"context"
-
-	log "github.com/sirupsen/logrus"
 )
 
 func NewFactory(ctx context.Context, wgPort int) *Factory {
 	f := &Factory{wgPort: wgPort}
 
-	ebpfProxy := NewWGEBPFProxy(ctx, wgPort)
-	err := ebpfProxy.listen()
-	if err != nil {
-		log.Warnf("failed to initialize ebpf proxy, fallback to user space proxy: %s", err)
-		return f
-	}
-
-	f.ebpfProxy = ebpfProxy
 	return f
 }