Implement result getter

Hcs.WebApp/BackgroundServices/ResultGetters/IResultGetter.cs

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+namespace Hcs.WebApp.BackgroundServices.ResultGetters
+{
+    public interface IResultGetter
+    {
+        Task<ResultGetterResponse> GetAsync();
+    }
+}

Hcs.WebApp/BackgroundServices/ResultGetters/NsiCommon/ExportNsiItemGetter_15_7_0_1.cs

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+using Hcs.Broker;
+using Hcs.WebApp.Data.Hcs;
+using Hcs.WebApp.Services;
+
+namespace Hcs.WebApp.BackgroundServices.ResultGetters.NsiCommon
+{
+    public class ExportNsiItemGetter_15_7_0_1(IClient client, IServiceScope scope, Operation operation) : ResultGetterBase(client, scope, operation)
+    {
+        public override async Task<ResultGetterResponse> GetAsync()
+        {
+            var result = await client.NsiCommon.GetExportNsiItemResultAsync(operation.MessageGuid!);
+            if (!result.Ready)
+            {
+                return ResultGetterResponse.NotReady;
+            }
+
+            if (result.Success)
+            {
+                var registryService = scope.ServiceProvider.GetRequiredService<RegistryService>();
+                var registry = await registryService.GetRegistryByOperationIdAsync(operation.Id);
+                // TODO
+
+                return ResultGetterResponse.Successful;
+            }
+
+            return ResultGetterResponse.Failed;
+        }
+    }
+}

Hcs.WebApp/BackgroundServices/ResultGetters/ResultGetterBase.cs

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+using Hcs.Broker;
+using Hcs.WebApp.Data.Hcs;
+
+namespace Hcs.WebApp.BackgroundServices.ResultGetters
+{
+    public abstract class ResultGetterBase(IClient client, IServiceScope scope, Operation operation) : IResultGetter
+    {
+        protected readonly IClient client = client;
+        protected readonly IServiceScope scope = scope;
+        protected readonly Operation operation = operation;
+
+        public abstract Task<ResultGetterResponse> GetAsync();
+    }
+}

Hcs.WebApp/BackgroundServices/ResultGetters/ResultGetterFactory.cs

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+using Hcs.Broker;
+using Hcs.WebApp.BackgroundServices.ResultGetters.NsiCommon;
+using Hcs.WebApp.Data.Hcs;
+
+namespace Hcs.WebApp.BackgroundServices.ResultGetters
+{
+    public class ResultGetterFactory
+    {
+        public IResultGetter CreateResultGetter(IServiceScope scope, IClient client, Operation operation)
+        {
+            switch (operation.Type)
+            {
+                case Operation.OperationType.NsiCommon_ExportNsiItem_15_7_0_1:
+                    return new ExportNsiItemGetter_15_7_0_1(client, scope, operation);
+            }
+
+            throw new NotImplementedException($"Не удалось создать получателя результата операции типа {operation.Type}");
+        }
+    }
+
+}

Hcs.WebApp/BackgroundServices/ResultGetters/ResultGetterResponse.cs

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+namespace Hcs.WebApp.BackgroundServices.ResultGetters
+{
+    public enum ResultGetterResponse
+    {
+        NotReady,
+        Successful,
+        Failed
+    }
+}