feat(health): 危急值告警消费者 — 幂等处理 + Handler + 路由

- event.rs: 消费 health_data.critical_alert 事件创建告警记录
- handler: list/get/acknowledge 三个端点
- 路由: /health/critical-alerts, /health/critical-alerts/{id}/acknowledge
- 权限: health.critical-alert.list / health.critical-alert.manage

crates/erp-health/src/handler/mod.rs

@@ -6,6 +6,7 @@ pub mod article_handler;
 pub mod article_tag_handler;
 pub mod consultation_handler;
 pub mod consent_handler;
+pub mod critical_alert_handler;
 pub mod critical_value_threshold_handler;
 pub mod daily_monitoring_handler;
 pub mod device_reading_handler;