Fix missing UDP timeout for QUIC protocols

inbound/hysteria2.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"net/http/httputil"
 	"net/url"
+	"time"
 
 	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/common/tls"
@@ -87,6 +88,12 @@ func NewHysteria2(ctx context.Context, router adapter.Router, logger log.Context
 		},
 		tlsConfig: tlsConfig,
 	}
+	var udpTimeout time.Duration
+	if options.UDPTimeout != 0 {
+		udpTimeout = time.Duration(options.UDPTimeout)
+	} else {
+		udpTimeout = C.UDPTimeout
+	}
 	service, err := hysteria2.NewService[int](hysteria2.ServiceOptions{
 		Context:               ctx,
 		Logger:                logger,
@@ -96,6 +103,7 @@ func NewHysteria2(ctx context.Context, router adapter.Router, logger log.Context
 		SalamanderPassword:    salamanderPassword,
 		TLSConfig:             tlsConfig,
 		IgnoreClientBandwidth: options.IgnoreClientBandwidth,
+		UDPTimeout:            udpTimeout,
 		Handler:               adapter.NewUpstreamHandler(adapter.InboundContext{}, inbound.newConnection, inbound.newPacketConnection, nil),
 		MasqueradeHandler:     masqueradeHandler,
 	})