базовая логика скачивания обновлений

lib/features/launcher/domain/entities/client_manifest_file.dart

@@ -0,0 +1,26 @@
+import 'client_hash_entry.dart';
+
+final class ClientManifestFile implements ClientHashEntry {
+  @override
+  final String path;
+
+  @override
+  final int size;
+
+  @override
+  final String sha256;
+
+  const ClientManifestFile({
+    required this.path,
+    required this.size,
+    required this.sha256,
+  });
+
+  factory ClientManifestFile.fromJson(Map<String, dynamic> json) {
+    return ClientManifestFile(
+      path: normalizeClientPath(json['path'] as String? ?? ''),
+      size: (json['size'] as num? ?? 0).toInt(),
+      sha256: (json['sha256'] as String? ?? '').toLowerCase(),
+    );
+  }
+}