Added a prompt injection detection (#857)

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

app/MindWork AI Studio/Assistants/SlideBuilder/SlideAssistant.razor.cs

@@ -2,6 +2,7 @@
 using AIStudio.Chat;
 using AIStudio.Dialogs.Settings;
 using AIStudio.Tools.AssistantSessions;
+using AIStudio.Tools.Security;
 
 namespace AIStudio.Assistants.SlideBuilder;
 
@@ -373,6 +374,13 @@ public partial class SlideAssistant : AssistantBaseCore<SettingsDialogSlideBuild
                           """);
         }
 
+        //
+        // One report for the whole batch: reading twenty documents must produce one dialog
+        // listing all of them, not twenty dialogs in a row.
+        //
+        var guardService = Program.SERVICE_PROVIDER.GetRequiredService<PromptInjectionGuardService>();
+        await using var promptInjectionScope = guardService.BeginAction();
+
         var numDocuments = 1;
         foreach (var document in documents)
         {