improve: move backoff to global module

internal/config/backoff.go

@@ -8,7 +8,7 @@ import (
 var BackoffConfig backoff.Conf
 
 func initBackoff() {
-	setting := Settings.Guardian.Backoff
+	setting := Settings.Backoff
 	BackoffConfig = backoff.Conf{
 		Logger:           Logger,
 		DisableRecovery:  true,

internal/config/models.go

@@ -10,10 +10,10 @@ type (
 	GuardianConf struct {
 		Enable   bool `json:"enable" yaml:"enable"`
 		Duration uint `json:"duration" yaml:"duration"`
-		Backoff  BackoffConf `json:"backoff" yaml:"backoff"`
 	}
 
 	BackoffConf struct {
+		Enable          bool `json:"enable" yaml:"enable"`
 		MaxRetries      uint `json:"max_retries" yaml:"max_retries"`
 		InitialDuration uint `json:"initial_duration" yaml:"initial_duration"`
 		MaxDuration     uint `json:"max_duration" yaml:"max_duration"`
@@ -60,6 +60,7 @@ type (
 type SettingsConf struct {
 	Basic        BasicConf              `json:"basic" yaml:"basic"`
 	Guardian     GuardianConf           `json:"guardian" yaml:"guardian"`
+	Backoff      BackoffConf            `json:"backoff" yaml:"backoff"`
 	Log          LogConf                `json:"log" yaml:"log"`
 	DDNS         DdnsConf               `json:"ddns" yaml:"ddns"`
 	Reality      RealityConf            `json:"reality" yaml:"reality"`