Add manual auth screen

moneymgr_mobile/lib/services/api/account_api.dart

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+/// Account API
+class AccountAPI {
+
+}

moneymgr_mobile/lib/services/api/api_client.dart

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+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+/// Client API
+@riverpod
+class ClientAPI {
+
+}

moneymgr_mobile/lib/services/api/api_token.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'api_token.freezed.dart';
+part 'api_token.g.dart';
+
+@freezed
+abstract class ApiToken with _$ApiToken {
+  const factory ApiToken({
+    required String apiUrl,
+    required int tokenId,
+    required String tokenValue
+  }) = _ApiToken;
+
+  factory ApiToken.fromJson(Map<String, dynamic> json) =>
+      _$ApiTokenFromJson(json);
+}