Improved data security for chat threads (#317)

app/MindWork AI Studio/Chat/ChatThread.cs

@@ -45,6 +45,11 @@ public sealed record ChatThread
     /// </summary>
     public string AugmentedData { get; set; } = string.Empty;
 
+    /// <summary>
+    /// The data security to use, derived from the data sources used so far.
+    /// </summary>
+    public DataSourceSecurity DataSecurity { get; set; } = DataSourceSecurity.NOT_SPECIFIED;
+
     /// <summary>
     /// The name of the chat thread. Usually generated by an AI model or manually edited by the user.
     /// </summary>