feat(sbp_payments): added cubit layer for sbp payments with tests

lib/features/payment/presentation/cubit/consultation_payment_cubit/consultation_payment_cubit.dart

@@ -0,0 +1,98 @@
+import 'dart:developer';
+
+import 'package:eatvio_app/core/error_reporting/report_from.dart';
+import 'package:eatvio_app/features/payment/presentation/cubit/consultation_payment_cubit/consultation_payment_state.dart';
+import 'package:eatvio_app/features/payment/repositories/payment_repository.dart';
+import 'package:eatvio_app/features/payment/repositories/sbp_repository.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:sbp/models/c2bmembers_model.dart';
+
+/// Cubit оплаты консультации через СБП: старт оплаты, список банков, редирект в банк.
+///
+/// Не хранит [planId] как поле — он передаётся в [startPayment].
+/// Polling статуса оплаты остаётся в ChatRoomCubit.
+class ConsultationPaymentCubit extends Cubit<ConsultationPaymentState> {
+  final PaymentRepository paymentRepository;
+  final SbpRepository sbpRepository;
+
+  ConsultationPaymentCubit({
+    required this.paymentRepository,
+    required this.sbpRepository,
+  }) : super(ConsultationPaymentState());
+
+  /// Запускает оплату для [planId], сохраняет checkout_url и загружает банки СБП.
+  Future<void> startPayment({required int planId}) async {
+    try {
+      emit(
+        state.copyWith(
+          isLoading: true,
+          errorMessage: null,
+          banks: const [],
+          checkoutUrl: null,
+          orderId: null,
+        ),
+      );
+
+      final payment = await paymentRepository.startPaymentProcess(planId: planId);
+
+      emit(
+        state.copyWith(
+          checkoutUrl: payment.paymentUrl,
+          orderId: payment.orderId,
+        ),
+      );
+
+      try {
+        final banks = await sbpRepository.getInstalledBanks();
+        if (isClosed) return;
+        emit(
+          state.copyWith(
+            banks: banks,
+            isLoading: false,
+            errorMessage: null,
+          ),
+        );
+      } catch (e, st) {
+        await reportFrom(e, st, this);
+        log(e.toString(), stackTrace: st);
+        if (isClosed) return;
+        emit(
+          state.copyWith(
+            isLoading: false,
+            banks: const [],
+            errorMessage: e.toString(),
+          ),
+        );
+      }
+    } catch (e, st) {
+      await reportFrom(e, st, this);
+      log(e.toString(), stackTrace: st);
+      if (isClosed) return;
+      emit(
+        state.copyWith(
+          isLoading: false,
+          banks: const [],
+          checkoutUrl: null,
+          orderId: null,
+          errorMessage: e.toString(),
+        ),
+      );
+    }
+  }
+
+  /// Открывает банковское приложение [bank] с текущим [ConsultationPaymentState.checkoutUrl].
+  Future<bool> openBank({required C2bmemberModel bank}) async {
+    final checkoutUrl = state.checkoutUrl;
+    if (checkoutUrl == null || checkoutUrl.isEmpty) {
+      return false;
+    }
+
+    try {
+      return await sbpRepository.openBank(url: checkoutUrl, bank: bank);
+    } catch (e, st) {
+      await reportFrom(e, st, this);
+      log(e.toString(), stackTrace: st);
+      return false;
+    }
+  }
+}

lib/features/payment/presentation/cubit/consultation_payment_cubit/consultation_payment_state.dart

@@ -0,0 +1,15 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:sbp/models/c2bmembers_model.dart';
+
+part 'consultation_payment_state.freezed.dart';
+
+@freezed
+abstract class ConsultationPaymentState with _$ConsultationPaymentState {
+  factory ConsultationPaymentState({
+    @Default(false) bool isLoading,
+    @Default([]) List<C2bmemberModel> banks,
+    String? checkoutUrl,
+    String? orderId,
+    String? errorMessage,
+  }) = _ConsultationPaymentState;
+}