feat(wm-production): #67 报警规则引擎与报警管理中心
- DDL: V2__alert_engine.sql (prod_alert_rule, prod_alert_record, prod_alert_notification, prod_alert_rule_device)
- Entity: AlertRule(规则定义), AlertRecord(全生命周期增强), AlertNotification(通知记录)
- Mapper: AlertRuleMapper, AlertRecordMapper(自定义关联SQL), AlertNotificationMapper
- Service: AlertRuleService(规则CRUD + AND/OR组合条件评估引擎 + 阈值触发 + 多级别报警)
- Service: AlertCenterService(报警全生命周期: 确认/派单/处理/归档 + 统计看板)
- Controller: AlertController 23个RESTful端点 (/api/production/alert/*)
- 单元测试: AlertRuleServiceTest(12个) + AlertCenterServiceTest(5个) = 17个测试
