Added a prompt injection detection (#857)

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

app/MindWork AI Studio/Tools/ContentStreamPromptInjectionDetails.cs

@@ -0,0 +1,28 @@
+using System.Text.Json.Serialization;
+using AIStudio.Tools.Security;
+
+namespace AIStudio.Tools;
+
+// ReSharper disable UnusedAutoPropertyAccessor.Global
+// ReSharper disable ClassNeverInstantiated.Global
+
+/// <summary>
+/// Reports that the runtime filtered suspected prompt injections out of a file.
+/// </summary>
+/// <remarks>
+/// This is a notice, not a failure: the file was read and everything around the filtered
+/// passages is intact. It travels beside the content rather than as an error code, because the
+/// app needs the findings themselves to tell the user what was removed.
+/// </remarks>
+public sealed class ContentStreamPromptInjectionDetails
+{
+    [JsonPropertyName("findings")]
+    public List<PromptInjectionFinding>? Findings { get; init; }
+
+    /// <summary>
+    /// How many passages were filtered. Can exceed the number of findings, because the runtime
+    /// caps how many it reports in detail while it filters every single one.
+    /// </summary>
+    [JsonPropertyName("redacted_count")]
+    public int RedactedCount { get; init; }
+}