chore: remove Script mode residual code.

tunnel/mode.go

@@ -12,14 +12,12 @@ type TunnelMode int
 var ModeMapping = map[string]TunnelMode{
 	Global.String(): Global,
 	Rule.String():   Rule,
-	Script.String(): Script,
 	Direct.String(): Direct,
 }
 
 const (
 	Global TunnelMode = iota
 	Rule
-	Script
 	Direct
 )
 
@@ -63,8 +61,6 @@ func (m TunnelMode) String() string {
 		return "global"
 	case Rule:
 		return "rule"
-	case Script:
-		return "script"
 	case Direct:
 		return "direct"
 	default: