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实现Saga分布式事务补偿

未完成

示例

输入
solve()
期望输出
saga-order-001 final: completed
  [saga-order-002] step=create_payment FAILED, triggering compensation...
  compensate: restore_inventory (product-service)
  saga-order-002 final: compensated
  [saga-order-003] step=update_order_status PENDING
  saga-order-003 final: pending
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