Added options to enforce minimum confidence levels for each assistant (#147)

app/MindWork AI Studio/Settings/DataModel/DataRewriteImprove.cs

@@ -1,4 +1,5 @@
 using AIStudio.Assistants.RewriteImprove;
+using AIStudio.Provider;
 
 namespace AIStudio.Settings.DataModel;
 
@@ -29,6 +30,11 @@ public sealed class DataRewriteImprove
     /// </summary>
     public SentenceStructure PreselectedSentenceStructure { get; set; }
     
+    /// <summary>
+    /// The minimum confidence level required for a provider to be considered.
+    /// </summary>
+    public ConfidenceLevel MinimumProviderConfidence { get; set; } = ConfidenceLevel.NONE;
+    
     /// <summary>
     /// Preselect a provider?
     /// </summary>