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

app/MindWork AI Studio/Dialogs/DataSourceLocalFileDialog.razor

@@ -69,6 +69,8 @@
                     </MudSelectItem>
                 }
             </MudSelect>
+            
+            <MudNumericField T="ushort" Min="10" @bind-Value="@this.dataMaxMatches" Label="@T("How many matches do you want at most per query?")" Variant="Variant.Outlined" Step="10" />
         </MudForm>
         <Issues IssuesData="@this.dataIssues"/>
     </DialogContent>