refactor(core): drop usecase from adapter deps, migrate interface_adapters to adapters

ElectrumServersAdapter (electrum), ElectrumServerAdapter (blockchain,
wallet) previously depended on GetElectrumServersToUseUsecase — an
application-layer use case invoked from secondary adapters, reversing
the layer-direction rule. The usecase served these adapters only.

Absorb the orchestration (fetch + filter custom + sort by priority)
into ElectrumServerRepository.fetchActiveServers as a query method.
The two non-electrum adapters compose it with ElectrumSettingsRepository
and SettingsRepository (for tor proxy) inline. Delete the usecase plus
its request/response DTOs.

Relocate all touched files from the legacy interface_adapters/ folder
to the canonical adapters/ folder (electrum, wallet — matching the
blockchain move already in flight). Remaining interface_adapters/
usage in tor/mempool/swaps/status is out of scope for this PR.

Author: ethicnology

lib/core/blockchain/adapters/electrum_server_adapter.dart

@@ -0,0 +1,56 @@
+import 'package:bb_mobile/core/blockchain/domain/ports/electrum_server_port.dart';
+import 'package:bb_mobile/core/electrum/domain/repositories/electrum_server_repository.dart';
+import 'package:bb_mobile/core/electrum/domain/repositories/electrum_settings_repository.dart';
+import 'package:bb_mobile/core/electrum/domain/value_objects/electrum_server_network.dart';
+import 'package:bb_mobile/core/settings/data/settings_repository.dart';
+
+class ElectrumServerAdapter implements ElectrumServerPort {
+  final ElectrumServerRepository _electrumServerRepository;
+  final ElectrumSettingsRepository _electrumSettingsRepository;
+  final SettingsRepository _settingsRepository;
+
+  ElectrumServerAdapter({
+    required ElectrumServerRepository electrumServerRepository,
+    required ElectrumSettingsRepository electrumSettingsRepository,
+    required SettingsRepository settingsRepository,
+  }) : _electrumServerRepository = electrumServerRepository,
+       _electrumSettingsRepository = electrumSettingsRepository,
+       _settingsRepository = settingsRepository;
+
+  @override
+  Future<List<ElectrumServer>> getElectrumServers({
+    required bool isTestnet,
+    required bool isLiquid,
+  }) async {
+    final network = ElectrumServerNetwork.fromEnvironment(
+      isTestnet: isTestnet,
+      isLiquid: isLiquid,
+    );
+
+    final (activeServers, settings, appSettings) = await (
+      _electrumServerRepository.fetchActiveServers(network: network),
+      _electrumSettingsRepository.fetchByNetwork(network),
+      _settingsRepository.fetch(),
+    ).wait;
+
+    // Tor proxy applies to Bitcoin only, never Liquid.
+    final socks5Url = (appSettings.useTorProxy && !isLiquid)
+        ? (settings.socks5 ?? '127.0.0.1:${appSettings.torProxyPort}')
+        : settings.socks5;
+
+    return activeServers
+        .map(
+          (e) => ElectrumServer(
+            url: e.url,
+            priority: e.priority,
+            retry: settings.retry,
+            timeout: settings.timeout,
+            stopGap: settings.stopGap,
+            validateDomain: settings.validateDomain,
+            socks5: socks5Url,
+            isCustom: e.isCustom,
+          ),
+        )
+        .toList();
+  }
+}

lib/core/blockchain/blockchain_locator.dart

@@ -6,8 +6,9 @@ import 'package:bb_mobile/core/blockchain/domain/ports/electrum_server_port.dart
 import 'package:bb_mobile/core/blockchain/domain/repositories/liquid_blockchain_repository.dart';
 import 'package:bb_mobile/core/blockchain/domain/usecases/broadcast_bitcoin_transaction_usecase.dart';
 import 'package:bb_mobile/core/blockchain/domain/usecases/broadcast_liquid_transaction_usecase.dart';
-import 'package:bb_mobile/core/blockchain/interface_adapters/adapters/electrum_server_adapter.dart';
-import 'package:bb_mobile/core/electrum/application/usecases/get_electrum_servers_to_use_usecase.dart';
+import 'package:bb_mobile/core/blockchain/adapters/electrum_server_adapter.dart';
+import 'package:bb_mobile/core/electrum/domain/repositories/electrum_server_repository.dart';
+import 'package:bb_mobile/core/electrum/domain/repositories/electrum_settings_repository.dart';
 import 'package:bb_mobile/core/settings/data/settings_repository.dart';
 import 'package:get_it/get_it.dart';
 
@@ -39,8 +40,9 @@ class BlockchainLocator {
   static void registerPorts(GetIt locator) {
     locator.registerLazySingleton<ElectrumServerPort>(
       () => ElectrumServerAdapter(
-        getElectrumServersToUseUsecase:
-            locator<GetElectrumServersToUseUsecase>(),
+        electrumServerRepository: locator<ElectrumServerRepository>(),
+        electrumSettingsRepository: locator<ElectrumSettingsRepository>(),
+        settingsRepository: locator<SettingsRepository>(),
       ),
     );
   }

lib/core/blockchain/interface_adapters/adapters/electrum_server_adapter.dart

@@ -63,6 +63,20 @@ class DriftElectrumServerRepository implements ElectrumServerRepository {
         .then((models) => models.map((e) => e.toEntity()).toList());
   }
 
+  @override
+  Future<List<ElectrumServer>> fetchActiveServers({
+    required ElectrumServerNetwork network,
+  }) async {
+    final servers = await fetchAll(
+      isTestnet: network.isTestnet,
+      isLiquid: network.isLiquid,
+    );
+    final customServers = servers.where((s) => s.isCustom).toList();
+    final activeServers = customServers.isNotEmpty ? customServers : servers;
+    activeServers.sort((a, b) => a.priority.compareTo(b.priority));
+    return activeServers;
+  }
+
   @override
   Future<void> delete({required String url}) {
     return _datasource.deleteServer(url);

…es/drift_electrum_server_repository.dart …rs/drift_electrum_server_repository.dartlib/core/electrum/interface_adapters/repositories/drift_electrum_server_repository.dart renamed to lib/core/electrum/adapters/drift_electrum_server_repository.dart lib/core/electrum/interface_adapters/repositories/drift_electrum_server_repository.dart renamed to lib/core/electrum/adapters/drift_electrum_server_repository.dart

@@ -0,0 +1,18 @@
+import 'package:bb_mobile/core/electrum/domain/entities/electrum_server.dart';
+import 'package:bb_mobile/core/electrum/domain/ports/electrum_servers_port.dart';
+import 'package:bb_mobile/core/electrum/domain/repositories/electrum_server_repository.dart';
+import 'package:bb_mobile/core/electrum/domain/value_objects/electrum_server_network.dart';
+
+class ElectrumServersAdapter implements ElectrumServersPort {
+  final ElectrumServerRepository _repository;
+
+  ElectrumServersAdapter({required ElectrumServerRepository repository})
+    : _repository = repository;
+
+  @override
+  Future<List<ElectrumServer>> getServersToUse({
+    required ElectrumServerNetwork network,
+  }) {
+    return _repository.fetchActiveServers(network: network);
+  }
+}