Load server configuration

moneymgr_mobile/lib/services/storage/prefs.dart

@@ -1,4 +1,7 @@
+import 'dart:convert';
+
 import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:moneymgr_mobile/services/api/server_api.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
@@ -9,3 +12,19 @@ Future<SharedPreferencesWithCache> prefs(Ref ref) =>
     SharedPreferencesWithCache.create(
       cacheOptions: const SharedPreferencesWithCacheOptions(),
     );
+
+extension MoneyMgrSharedPreferences on SharedPreferencesWithCache {
+  ServerConfig? serverConfig() {
+    final json = getString("serverConfig");
+    if (json != null) return ServerConfig.fromJson(jsonDecode(json));
+    return null;
+  }
+
+  Future<void> setServerConfig(ServerConfig config) async {
+    await setString("serverConfig", jsonEncode(config));
+  }
+
+  Future<void> clearServerConfig() async {
+    await remove("serverConfig");
+  }
+}