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/event.rs

@@ -156,4 +156,62 @@ pub fn register_handlers_with_state(state: crate::state::HealthState) {
             }
         }
     });
+
+    // health_data.critical_alert → 创建危急值告警记录
+    let (mut critical_rx, _critical_handle) = state.event_bus.subscribe_filtered("health_data.".to_string());
+    let critical_state = state.clone();
+    tokio::spawn(async move {
+        loop {
+            match critical_rx.recv().await {
+                Some(event) if event.event_type == HEALTH_DATA_CRITICAL_ALERT => {
+                    // 幂等检查
+                    if erp_core::events::is_event_processed(&critical_state.db, event.id, "critical_alert_consumer").await.unwrap_or(false) {
+                        continue;
+                    }
+
+                    let patient_id = event.payload.get("patient_id")
+                        .and_then(|v| v.as_str())
+                        .and_then(|s| Uuid::parse_str(s).ok());
+                    let alert_type = event.payload.get("alert_type").and_then(|v| v.as_str()).unwrap_or("vital_sign");
+                    let metric_name = event.payload.get("metric_name").and_then(|v| v.as_str()).unwrap_or("unknown");
+                    let metric_value = event.payload.get("metric_value").and_then(|v| v.as_str()).unwrap_or("");
+                    let threshold_value = event.payload.get("threshold_value").and_then(|v| v.as_str()).unwrap_or("");
+
+                    if let Some(pid) = patient_id {
+                        match crate::service::critical_alert_service::handle_critical_alert_event(
+                            &critical_state,
+                            event.tenant_id,
+                            pid,
+                            alert_type,
+                            metric_name,
+                            metric_value,
+                            threshold_value,
+                            None,
+                        ).await {
+                            Ok(alert_id) => {
+                                tracing::info!(
+                                    event_id = %event.id,
+                                    alert_id = %alert_id,
+                                    patient_id = %pid,
+                                    metric = %metric_name,
+                                    "危急值告警已创建"
+                                );
+                                let _ = erp_core::events::mark_event_processed(&critical_state.db, event.id, "critical_alert_consumer").await;
+                            }
+                            Err(e) => {
+                                tracing::error!(
+                                    event_id = %event.id,
+                                    patient_id = %pid,
+                                    error = %e,
+                                    "危急值告警创建失败"
+                                );
+                            }
+                        }
+                    }
+                }
+                Some(_) => {}
+                None => break,
+            }
+        }
+    });
 }