fix & opt.

- fix: `sftpGoPath`
- opt.: `PersistentStore.toJson`
- rm: `first` store
- opt.: log print

lib/data/model/app/backup.dart

@@ -60,11 +60,11 @@ class Backup {
         spis = Stores.server.fetch(),
         snippets = Stores.snippet.fetch(),
         keys = Stores.key.fetch(),
-        dockerHosts = Stores.docker.fetchAll(),
+        dockerHosts = Stores.docker.toJson(),
         settings = Stores.setting.toJson();
 
   static Future<String> backup() async {
-    final result = _diyEncrtpt(json.encode(Backup.loadFromStore()));
+    final result = _diyEncrypt(json.encode(Backup.loadFromStore()));
     final path = await Paths.bak;
     await File(path).writeAsString(result);
     return path;
@@ -95,7 +95,7 @@ class Backup {
       : this.fromJson(json.decode(_diyDecrypt(raw)));
 }
 
-String _diyEncrtpt(String raw) => json.encode(
+String _diyEncrypt(String raw) => json.encode(
       raw.codeUnits.map((e) => e * 2 + 1).toList(growable: false),
     );
 

lib/data/model/pkg/manager.dart

@@ -68,7 +68,9 @@ enum PkgManager {
         list.removeWhere((element) => element.isEmpty);
         final endLine = list.lastIndexWhere(
             (element) => element.contains('Obsoleting Packages'));
-        list = list.sublist(0, endLine);
+        if (endLine != -1 && list.isNotEmpty) {
+          list = list.sublist(0, endLine);
+        }
         break;
       case PkgManager.apt:
         // avoid other outputs