Complete Step 2.2: Add enums for business concepts

Updated ROADMAP.md to mark Step 2.2 ("Enums erstellen") as completed, documenting the creation of `DocumentOperationType` and `ProcessingStatus` enums.

Added `DocumentOperationType` and `ProcessingStatus` enums under the `DocumentOperator.Domain.Models.Enums` namespace to represent document operations and processing statuses, respectively.

Modified `DocumentOperator.Domain.csproj` to remove the `Models\Enums\` folder from the `<ItemGroup>` section, reflecting changes in the inclusion strategy for enums.

DocumentOperator.Domain/DocumentOperator.Domain.csproj

@@ -9,7 +9,6 @@
   <ItemGroup>
     <Folder Include="Common\Results\" />
     <Folder Include="Constants\" />
-    <Folder Include="Models\Enums\" />
     <Folder Include="Models\ValueObjects\" />
   </ItemGroup>
 

DocumentOperator.Domain/Models/Enums/DocumentOperationType.cs

@@ -0,0 +1,10 @@
+namespace DocumentOperator.Domain.Models.Enums;
+
+public enum DocumentOperationType
+{
+    Validate,
+    ExtractAttachments,
+    Concatenate,
+    ApplyStamp,
+    EmbedCertificate
+}

DocumentOperator.Domain/Models/Enums/ProcessingStatus.cs

@@ -0,0 +1,9 @@
+namespace DocumentOperator.Domain.Models.Enums;
+
+public enum ProcessingStatus
+{
+    Pending,
+    Processing,
+    Success,
+    Failed
+}