Remove SFTP download

lib/core/extension/numx.dart

@@ -0,0 +1,15 @@
+extension NumX on num {
+  String get convertBytes {
+    const suffix = ['B', 'KB', 'MB', 'GB', 'TB'];
+    double value = toDouble();
+    int squareTimes = 0;
+    for (; value / 1024 > 1 && squareTimes < suffix.length - 1; squareTimes++) {
+      value /= 1024;
+    }
+    var finalValue = value.toStringAsFixed(1);
+    if (finalValue.endsWith('.0')) {
+      finalValue = finalValue.replaceFirst('.0', '');
+    }
+    return '$finalValue ${suffix[squareTimes]}';
+  }
+}

lib/core/path.dart

@@ -0,0 +1,12 @@
+import 'dart:io';
+
+import 'package:path_provider/path_provider.dart';
+
+Future<Directory> get sftpDownloadDir async {
+  final docDir = await getApplicationDocumentsDirectory();
+  final dir = Directory('${docDir.path}/sftp');
+  if (!dir.existsSync()) {
+    dir.createSync();
+  }
+  return dir;
+}