feat(Clash): Add routing rules and enable routing option for Clash subscriptions (#4904)

* feat(clash): add routing rules and enable routing option for Clash/Mihomo subscriptions

Allows adding custom YAML blocks and placeholders to Clash exports.

Why: Shifting routing to the client prevents server IP exposure for
DIRECT traffic and reduces unnecessary server bandwidth/CPU usage.

* fix

---------

Co-authored-by: Misfit-s <>

sub/subController.go

@@ -66,6 +66,8 @@ func NewSUBController(
 	jsonNoise string,
 	jsonMux string,
 	jsonRules string,
+	clashEnableRouting bool,
+	clashRules string,
 	subTitle string,
 	subSupportUrl string,
 	subProfileUrl string,
@@ -91,7 +93,7 @@ func NewSUBController(
 
 		subService:      sub,
 		subJsonService:  NewSubJsonService(jsonFragment, jsonNoise, jsonMux, jsonRules, sub),
-		subClashService: NewSubClashService(sub),
+		subClashService: NewSubClashService(clashEnableRouting, clashRules, sub),
 	}
 	a.initRouter(g)
 	return a