Show outbound traffic in outbounds table (#1711)

* store outbound traffic in database

* show outbound traffic in outbounds table

* add refresh button

database/db.go

@@ -21,6 +21,7 @@ var db *gorm.DB
 var initializers = []func() error{
 	initUser,
 	initInbound,
+	initOutbound,
 	initSetting,
 	initInboundClientIps,
 	initClientTraffic,
@@ -51,6 +52,10 @@ func initInbound() error {
 	return db.AutoMigrate(&model.Inbound{})
 }
 
+func initOutbound() error {
+	return db.AutoMigrate(&model.OutboundTraffics{})
+}
+
 func initSetting() error {
 	return db.AutoMigrate(&model.Setting{})
 }