Added an optional notice for AI-generated content (#884)

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

app/MindWork AI Studio/Tools/Services/AIGeneratedContentDisclosureService.cs

@@ -0,0 +1,44 @@
+using AIStudio.Settings;
+using AIStudio.Tools.PluginSystem;
+
+namespace AIStudio.Tools.Services;
+
+/// <summary>
+/// Adds a notice to AI-generated content before it leaves AI Studio, which says that AI generated it.
+/// </summary>
+/// <remarks>
+/// The notice is off by default. Whether a text has to say that AI generated it depends on what happens
+/// to it afterward, for example, whether it is published, as transparency rules such as the EU AI Act
+/// ask. Only the user or their organization knows that, so the user switches it on in the app settings,
+/// or an organization does so for everybody with a configuration plugin.
+///
+/// The notice ends the content as a paragraph of its own, in the language of the app. It leaves the
+/// answer itself untouched, and a reader finds it where the text ends, below the sources as well.
+/// It is Markdown, like everything else AI Studio copies or exports, which is why it is bold in a
+/// document and stays readable as plain text.
+///
+/// Only content a reader takes as a whole gets the notice: an answer which is copied or exported, and
+/// the files of a batch run. Where one sentence more breaks what the user wanted, it stays away: a code
+/// block, a single file or table out of an answer, the table of a batch run, and the Lua code of the
+/// assistant builder. The prompt of the prompt optimizer goes on to another model instead of a reader,
+/// and a visual briefing is exported as the very version AI Studio checked, byte for byte, so neither
+/// of them gets the notice. Messages of the user, transcripts, IDs, and paths are no AI answers.
+/// </remarks>
+public sealed class AIGeneratedContentDisclosureService(SettingsManager settingsManager)
+{
+    private static string TB(string fallbackEN) => I18N.I.T(fallbackEN, typeof(AIGeneratedContentDisclosureService).Namespace, nameof(AIGeneratedContentDisclosureService));
+
+    /// <summary>
+    /// Adds the notice below the given Markdown text, when it is switched on.
+    /// </summary>
+    /// <param name="markdown">The Markdown text which AI generated.</param>
+    /// <returns>The text followed by the notice, or the text itself when the notice is off or there is no text.</returns>
+    public string AddDisclosureToMarkdown(string markdown)
+    {
+        if (!settingsManager.ConfigurationData.App.AddAIGeneratedContentDisclosure || string.IsNullOrWhiteSpace(markdown))
+            return markdown;
+
+        var disclosure = Markdown.EscapeInlineText(TB("This content was generated using artificial intelligence (AI)."));
+        return Markdown.AppendBlock(markdown.TrimEnd('\r', '\n'), $"**{disclosure}**");
+    }
+}