fix: sing listener panic

constant/tunnel.go

@@ -1,10 +1,12 @@
 package constant
 
+import "net"
+
 type Tunnel interface {
 	// HandleTCPConn will handle a tcp connection blocking
-	HandleTCPConn(connCtx ConnContext)
+	HandleTCPConn(conn net.Conn, metadata *Metadata)
 	// HandleUDPPacket will handle a udp packet nonblocking
-	HandleUDPPacket(packet PacketAdapter)
+	HandleUDPPacket(packet UDPPacket, metadata *Metadata)
 	// NatTable return nat table
 	NatTable() NatTable
 }