综合：订餐全流程端到端模拟

solve()

Order pipeline simulation:
  USR-0001 lunch: completed
    [ok] check_menu: menu available for 2026-03-10 lunch
    [ok] select_dish: dish selected: 宫保鸡丁
    [ok] check_balance: balance sufficient: 85.5
    [ok] create_order: ORD-2550 created
    [ok] deduct_balance: 15.0 deducted
    [ok] notify: push notification sent
  USR-0002 breakfast: completed
    [ok] check_menu: menu available for 2026-03-10 breakfast
    [ok] filter_dishes: vegetarian filter applied
    [ok] select_dish: 素什锦
    [ok] check_balance: balance sufficient: 85.5
    [ok] create_order: ORD-3083 created
    [ok] deduct_balance: 15.0 deducted
    [ok] notify: push notification sent