feat: support mieru inbound (#2347)

constant/metadata.go

@@ -38,6 +38,7 @@ const (
 	TUIC
 	HYSTERIA2
 	ANYTLS
+	MIERU
 	INNER
 )
 
@@ -109,6 +110,8 @@ func (t Type) String() string {
 		return "Hysteria2"
 	case ANYTLS:
 		return "AnyTLS"
+	case MIERU:
+		return "Mieru"
 	case INNER:
 		return "Inner"
 	default:
@@ -149,6 +152,8 @@ func ParseType(t string) (*Type, error) {
 		res = HYSTERIA2
 	case "ANYTLS":
 		res = ANYTLS
+	case "MIERU":
+		res = MIERU
 	case "INNER":
 		res = INNER
 	default: