opt.: upgrade linter & fix lint issues

lib/view/page/storage/local.dart

@@ -27,10 +27,10 @@ class LocalStoragePage extends StatefulWidget {
   final bool isPickFile;
   final String? initDir;
   const LocalStoragePage({
-    Key? key,
+    super.key,
     required this.isPickFile,
     this.initDir,
-  }) : super(key: key);
+  });
 
   @override
   State<LocalStoragePage> createState() => _LocalStoragePageState();

lib/view/page/storage/sftp.dart

@@ -36,11 +36,11 @@ class SftpPage extends StatefulWidget {
   final bool isSelect;
 
   const SftpPage({
-    Key? key,
+    super.key,
     required this.spi,
     required this.isSelect,
     this.initPath,
-  }) : super(key: key);
+  });
 
   @override
   _SftpPageState createState() => _SftpPageState();

lib/view/page/storage/sftp_mission.dart

@@ -16,7 +16,7 @@ import '../../widget/custom_appbar.dart';
 import '../../widget/cardx.dart';
 
 class SftpMissionPage extends StatefulWidget {
-  const SftpMissionPage({Key? key}) : super(key: key);
+  const SftpMissionPage({super.key});
 
   @override
   _SftpMissionPageState createState() => _SftpMissionPageState();