refactor: split providers into feature modules

lib/features/auth/providers/auth_providers.dart

@@ -0,0 +1,37 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../../app/error_message.dart';
+import '../../../app/load_state.dart';
+import '../../../models/auth_info.dart';
+import '../../shared/providers/core_providers.dart';
+
+final authInfoProvider =
+    NotifierProvider<AuthInfoNotifier, LoadState<AuthInfo?>>(
+      () => AuthInfoNotifier(),
+    );
+
+class AuthInfoNotifier extends Notifier<LoadState<AuthInfo?>> {
+  @override
+  LoadState<AuthInfo?> build() => const LoadState.idle(null);
+
+  Future<AuthInfo?> load({bool failOnError = false}) async {
+    state = LoadState.loading(state.data);
+    try {
+      final api = ref.read(apiProvider);
+      final res = await api.getAuthMe();
+      final authInfo = AuthInfo.fromApi(res.data);
+      state = LoadState.data(authInfo);
+      return authInfo;
+    } catch (e) {
+      state = LoadState.error(null, describeLoadError(e));
+      if (failOnError) rethrow;
+      return null;
+    }
+  }
+
+  void clear() => state = const LoadState.idle(null);
+
+  void restore(LoadState<AuthInfo?> restoredState) => state = restoredState;
+
+  bool get isAdmin => state.data?.isAdmin == true;
+}