More granular error handling

+ task queue refactoring

internal/contract/contract.go

@@ -23,3 +23,7 @@ type AudioRecognizer interface {
 	GetRecognitionText(operationID string) (string, error)
 	CheckRecognitionStatus(operationID string) (*entity.RecognitionResult, error)
 }
+
+type TelegramMessageSender interface {
+	Send(text string, chatId int64, replyToMessageId *int) error
+}