fix: incorrect storage path in linux (#270)

ui/flutter/lib/util/log_util.dart

@@ -1,18 +1,24 @@
 import 'dart:io';
 import 'package:flutter/foundation.dart';
 import 'package:logger/logger.dart';
+import 'package:path/path.dart' as path;
 import 'util.dart';
 
-final logger = Logger(
-  filter: ProductionFilter(),
-  printer: SimplePrinter(printTime: true, colors: false),
-  output: buildOutput(),
-);
+late final Logger logger;
 
-buildOutput() {
+initLogger() {
+  // if is debug mode, don't log to file
+  logger = Logger(
+    filter: ProductionFilter(),
+    printer: SimplePrinter(printTime: true, colors: false),
+    output: _buildOutput(),
+  );
+}
+
+_buildOutput() {
   // if is debug mode, don't log to file
   if (!kDebugMode && Util.isDesktop()) {
-    const logDirPath = 'logs';
+    final logDirPath = path.join(Util.getStorageDir(), 'logs');
     var logDir = Directory(logDirPath);
     if (!logDir.existsSync()) {
       logDir.createSync();