Add configuration for maximum matches per query across data sources (#484)

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

@@ -30,6 +30,9 @@ public readonly record struct DataSourceLocalDirectory : IInternalDataSource
     /// <inheritdoc />
     public DataSourceSecurity SecurityPolicy { get; init; } = DataSourceSecurity.NOT_SPECIFIED;
     
+    /// <inheritdoc />
+    public ushort MaxMatches { get; init; } = 10;
+    
     /// <inheritdoc />
     public Task<IReadOnlyList<IRetrievalContext>> RetrieveDataAsync(IContent lastPrompt, ChatThread thread, CancellationToken token = default)
     {