Added a SWOT analysis assistant (#1122)

Co-authored-by: hart_s3 <sabrina.hartmann@dlr.de>

app/MindWork AI Studio/Assistants/SWOTAnalysis/SwotContextualKnowledge.cs

@@ -0,0 +1,37 @@
+using AIStudio.Chat;
+
+namespace AIStudio.Assistants.SWOTAnalysis;
+
+/// <summary>
+/// The contextual knowledge of an analysis, prepared once for all of its requests.
+/// </summary>
+/// <remarks>
+/// The research and the four categories all need the same material. Read once, each document passes
+/// the prompt injection filter once, and a missing file or a broken image is reported once instead of
+/// five times. The text of the documents goes into the requests; only the images stay attachments.
+/// </remarks>
+/// <param name="Documents">The text of the documents, as the AI gets it; empty without documents.</param>
+/// <param name="Images">The images which the model can read and which could be prepared for it.</param>
+internal sealed record SwotContextualKnowledge(string Documents, IReadOnlyList<FileAttachment> Images)
+{
+    public static readonly SwotContextualKnowledge NONE = new(string.Empty, []);
+
+    /// <summary>
+    /// What the contextual-knowledge section of a request holds.
+    /// </summary>
+    public string Describe()
+    {
+        var images = this.Images.Count switch
+        {
+            0 => string.Empty,
+            1 => "The image attached to this message belongs to the contextual knowledge.",
+
+            _ => $"The {this.Images.Count} images attached to this message belong to the contextual knowledge.",
+        };
+
+        if (this.Documents.Length == 0)
+            return images.Length == 0 ? "No additional contextual knowledge was provided." : images;
+
+        return images.Length == 0 ? this.Documents : $"{this.Documents}\n\n{images}";
+    }
+}