feat(mq): 重构用户同步为MQ消息驱动并移除HTTP同步服务

- 将用户同步消息交换机由 DirectExchange 改为 TopicExchange，实现多目标系统路由
- 去除核心系统中用户同步队列定义和消费者，转由各子系统独立消费
- RabbitMQSyncProducer 动态构建 routing key，支持按目标系统路由同步消息
- UserServiceImpl 用户新增和更新后发送同步消息到 websopy 的 MQ 交换机
- 废弃 UserSyncService 中的 HTTP 同步接口，改为通过 MQ 实现用户数据同步
- 删除 UserSyncConsumer，核心系统不再直接消费用户同步消息
- 增加日志输出，便于追踪用户同步消息发送情况
- 保留废弃代码兼容旧引用，方便后续平滑迁移和维护

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