Improved docx and odt import (#890)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/ContentStreamDocumentMetadata.cs

@@ -1,4 +1,10 @@
+using System.Text.Json.Serialization;
+
 namespace AIStudio.Tools;
 
 // ReSharper disable ClassNeverInstantiated.Global
-public sealed class ContentStreamDocumentMetadata : ContentStreamSseMetadata;
+public sealed class ContentStreamDocumentMetadata : ContentStreamSseMetadata
+{
+    [JsonPropertyName("Document")]
+    public ContentStreamDocumentDetails? Document { get; init; }
+}