feat: add a Tools page printer for note merge and print presets

Chapter officers can merge a markdown note onto filtered students, teams, or events and save the recipe. Extra student-note columns are additional fields (any ## … fields heading) so they work as print tokens whether imported or typed by hand.

Co-authored-by: Cursor <cursoragent@cursor.com>

WebApp/Services/INotePrintService.cs

@@ -0,0 +1,28 @@
+using Core.Printing;
+
+namespace WebApp.Services;
+
+public class NotePrintRequest
+{
+    public required PrintEntityType EntityType { get; init; }
+
+    public required string TemplateMarkdown { get; init; }
+
+    public required PrintPresetFilters Filters { get; init; }
+
+    public required IReadOnlyList<string> ImportedFieldCatalog { get; init; }
+}
+
+public class NotePrintPage
+{
+    public required string DisplayName { get; init; }
+
+    public required string Html { get; init; }
+}
+
+public interface INotePrintService
+{
+    Task<IReadOnlyList<NotePrintPage>> PreviewAsync(
+        NotePrintRequest request,
+        CancellationToken cancellationToken = default);
+}