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/IPrintPresetService.cs

@@ -0,0 +1,18 @@
+using Core.Entities;
+
+namespace WebApp.Services;
+
+public interface IPrintPresetService
+{
+    Task<IReadOnlyList<PrintPreset>> GetAllAsync(CancellationToken cancellationToken = default);
+
+    Task<PrintPreset?> GetAsync(int id, CancellationToken cancellationToken = default);
+
+    Task<bool> NameExistsAsync(string name, int? excludeId = null, CancellationToken cancellationToken = default);
+
+    Task<PrintPreset> CreateAsync(PrintPreset preset, CancellationToken cancellationToken = default);
+
+    Task<PrintPreset> UpdateAsync(PrintPreset preset, CancellationToken cancellationToken = default);
+
+    Task DeleteAsync(int id, CancellationToken cancellationToken = default);
+}