implemented chat archive

app/lib/features/kagi/data/services/chat.dart

@@ -0,0 +1,32 @@
+import 'package:bang_navigator/core/http_error_handler.dart';
+import 'package:bang_navigator/features/settings/data/repositories/settings_repository.dart';
+import 'package:exceptions/exceptions.dart';
+import 'package:http/http.dart' as http;
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'chat.g.dart';
+
+@Riverpod(keepAlive: true)
+class KagiChatService extends _$KagiChatService {
+  late http.Client _client;
+
+  @override
+  void build() {
+    _client = http.Client();
+  }
+
+  Future<Result<String>> downloadChat(Uri url) {
+    final kagiSession =
+        ref.read(settingsRepositoryProvider).valueOrNull?.kagiSession;
+
+    return Result.fromAsync(
+      () async {
+        final response = await _client
+            .get(url.replace(queryParameters: {'token': kagiSession}));
+
+        return response.body;
+      },
+      exceptionHandler: handleHttpError,
+    );
+  }
+}

app/lib/features/kagi/data/services/chat.g.dart

@@ -0,0 +1,26 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'chat.dart';
+
+// **************************************************************************
+// RiverpodGenerator
+// **************************************************************************
+
+String _$kagiChatServiceHash() => r'80ead208a1d7ca0da98bd20f11c99efd0d682c8f';
+
+/// See also [KagiChatService].
+@ProviderFor(KagiChatService)
+final kagiChatServiceProvider =
+    NotifierProvider<KagiChatService, void>.internal(
+  KagiChatService.new,
+  name: r'kagiChatServiceProvider',
+  debugGetCreateSourceHash: const bool.fromEnvironment('dart.vm.product')
+      ? null
+      : _$kagiChatServiceHash,
+  dependencies: null,
+  allTransitiveDependencies: null,
+);
+
+typedef _$KagiChatService = Notifier<void>;
+// ignore_for_file: type=lint
+// ignore_for_file: subtype_of_sealed_class, invalid_use_of_internal_member, invalid_use_of_visible_for_testing_member