remove unused code

app/api/api.go

@@ -1,4 +0,0 @@
-package api
-
-type ApiServer struct {
-}

app/api/config.go

@@ -1,9 +0,0 @@
-package api
-
-import (
-	"v2ray.com/core/common/net"
-)
-
-type Config struct {
-	DirectPort net.Port
-}