refactor: split providers into feature modules

lib/features/api_keys/providers/api_keys_providers.dart

@@ -0,0 +1,52 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../../app/error_message.dart';
+import '../../../app/load_state.dart';
+import '../../../models/api_key_info.dart';
+import '../../shared/providers/core_providers.dart';
+
+final apiKeysProvider =
+    NotifierProvider<ApiKeysNotifier, LoadState<List<ApiKeyInfo>>>(
+      () => ApiKeysNotifier(),
+    );
+
+class ApiKeysNotifier extends Notifier<LoadState<List<ApiKeyInfo>>> {
+  @override
+  LoadState<List<ApiKeyInfo>> build() => const LoadState.idle(<ApiKeyInfo>[]);
+
+  Future<void> load() async {
+    state = LoadState.loading(state.data);
+    try {
+      final api = ref.read(apiProvider);
+      final res = await api.getApiKeys();
+      final keys = ApiKeyInfo.listFromApi(res.data);
+
+      state = keys.isEmpty ? LoadState.empty(keys) : LoadState.data(keys);
+    } catch (e) {
+      state = LoadState.error(state.data, describeLoadError(e));
+    }
+  }
+
+  Future<String> create(String name, {bool isAdmin = false}) async {
+    final api = ref.read(apiProvider);
+    final res = await api.createApiKey(name, isAdmin: isAdmin);
+    await load();
+    if (res.data is Map) {
+      final key = res.data['key']?.toString();
+      if (key != null && key.isNotEmpty) {
+        return key;
+      }
+    }
+    throw const FormatException('backend не вернул созданный API key');
+  }
+
+  Future<void> revoke(String key) async {
+    await ref.read(apiProvider).revokeApiKey(key);
+    await load();
+  }
+
+  Future<void> activate(String key) async {
+    await ref.read(apiProvider).activateApiKey(key);
+    await load();
+  }
+}