Aggiunge i tornei con hub, pagina pubblica e tabellone per semifinali e finali.

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

backend/db/migrate/20260904143000_add_invite_draft_to_tournaments.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class AddInviteDraftToTournaments < ActiveRecord::Migration[7.2]
+  def change
+    add_column :tournaments, :invite_draft_html, :text
+    add_column :tournaments, :invite_draft_note, :text
+    add_column :tournaments, :invite_draft_email, :string
+    add_column :tournaments, :invite_draft_saved_at, :datetime
+  end
+end