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

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

backend/app/controllers/api/v1/stream_sessions_controller.rb

@@ -6,6 +6,10 @@ module Api
       def create
         team_ids = current_user.streamable_teams.map(&:id)
         match = Match.where(team_id: team_ids).find(params[:match_id])
+        unless current_user.can_broadcast_match?(match)
+          return render json: { error: "Non sei incaricato di trasmettere questa partita" }, status: :forbidden
+        end
+
         session = Sessions::Create.new(user: current_user, match: match, params: session_params).call
         render json: session_json(session), status: :created
       end