big refactoring. get rid of static properties and coupled architecture. prepare system for integration tests

Azaion.Common/Services/FailsafeProducer.cs

@@ -23,6 +23,8 @@ public class FailsafeAnnotationsProducer
     private readonly IAzaionApi _azaionApi;
     private readonly QueueConfig _queueConfig;
     private readonly UIConfig _uiConfig;
+    private readonly IAnnotationPathResolver _pathResolver;
+    private readonly IFileSystem _fileSystem;
 
     private Producer _annotationProducer = null!;
 
@@ -31,14 +33,23 @@ public class FailsafeAnnotationsProducer
         IDbFactory dbFactory,
         IOptions<QueueConfig> queueConfig,
         IOptions<UIConfig> uiConfig,
-        IAzaionApi azaionApi)
+        IAzaionApi azaionApi,
+        IAnnotationPathResolver pathResolver,
+        IFileSystem fileSystem)
     {
         _logger = logger;
         _dbFactory = dbFactory;
         _azaionApi = azaionApi;
         _queueConfig = queueConfig.Value;
         _uiConfig = uiConfig.Value;
-        Task.Run(async () => await ProcessQueue());
+        _pathResolver = pathResolver;
+        _fileSystem = fileSystem;
+    }
+
+    public async Task StartAsync(CancellationToken ct = default)
+    {
+        _ = Task.Run(async () => await ProcessQueue(ct), ct);
+        await Task.CompletedTask;
     }
 
     private async Task<StreamSystem> GetProducerQueueConfig()
@@ -104,7 +115,7 @@ public class FailsafeAnnotationsProducer
                                 continue;
 
                             var image = record.Operation == AnnotationStatus.Created
-                                ? await File.ReadAllBytesAsync(annotation.ImagePath, ct)
+                                ? await _fileSystem.ReadAllBytesAsync(_pathResolver.GetImagePath(annotation), ct)
                                 : null;
 
                             var annMessage = new AnnotationMessage