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

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

backend/app/services/tournaments/revoke_assignment.rb

@@ -0,0 +1,20 @@
+module Tournaments
+  class RevokeAssignment
+    def self.call(assignment:)
+      new(assignment).call
+    end
+
+    def initialize(assignment)
+      @assignment = assignment
+    end
+
+    def call
+      invitation = @assignment.invitation
+      @assignment.destroy!
+      return unless invitation
+
+      leftover = invitation.assignments.reload.pluck(:match_id).map(&:to_s)
+      invitation.update!(scope_kind: "matches", match_ids: leftover, court: nil, on_date: nil)
+    end
+  end
+end