feat(dataflow): 添加链路联动 危急值→医嘱停止

- 创建 OrderStopRequestEvent 事件类
- CriticalValueHandler 添加联动逻辑：危急值确认后发布停嘱事件
- findRelatedOrders 为 stub，待接入医嘱服务

healthlink-his-server/healthlink-his-application/src/main/java/com/healthlink/his/web/dataflow/event/OrderStopRequestEvent.java

@@ -0,0 +1,20 @@
+package com.healthlink.his.web.dataflow.event;
+
+import org.springframework.context.ApplicationEvent;
+import lombok.Getter;
+
+@Getter
+public class OrderStopRequestEvent extends ApplicationEvent {
+    private final Long encounterId;
+    private final Long orderId;
+    private final String reason;
+    private final String triggerChain;
+
+    public OrderStopRequestEvent(Object source, Long encounterId, Long orderId, String reason, String triggerChain) {
+        super(source);
+        this.encounterId = encounterId;
+        this.orderId = orderId;
+        this.reason = reason;
+        this.triggerChain = triggerChain;
+    }
+}

healthlink-his-server/healthlink-his-application/src/main/java/com/healthlink/his/web/dataflow/handler/CriticalValueHandler.java

@@ -3,14 +3,18 @@ package com.healthlink.his.web.dataflow.handler;
 import com.healthlink.his.criticalvalue.domain.CriticalValue;
 import com.healthlink.his.criticalvalue.service.ICriticalValueService;
 import com.healthlink.his.web.dataflow.event.LabReportPublishedEvent;
+import com.healthlink.his.web.dataflow.event.OrderStopRequestEvent;
 import com.healthlink.his.web.dataflow.util.EventRetryUtil;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.context.event.EventListener;
 import org.springframework.scheduling.annotation.Async;
 import org.springframework.stereotype.Component;
 
+import java.util.ArrayList;
 import java.util.Date;
+import java.util.List;
 
 /**
  * Chain 4: 检验→危急值推送 — 检验报告发布后推送危急值
@@ -21,6 +25,7 @@ import java.util.Date;
 public class CriticalValueHandler {
 
     private final ICriticalValueService criticalValueService;
+    private final ApplicationEventPublisher eventPublisher;
 
     @Async
     @EventListener
@@ -43,6 +48,21 @@ public class CriticalValueHandler {
 
             log.info("Chain4 CriticalValue: critical value pushed for patientId={}, testItem={}",
                     event.getPatientId(), event.getTestItem());
+
+            // Chain 4 → Chain 2 联动: 危急值确认后触发医嘱停止请求
+            List<Long> relatedOrderIds = findRelatedOrders(event.getEncounterId(), event.getPatientId());
+            for (Long orderId : relatedOrderIds) {
+                eventPublisher.publishEvent(new OrderStopRequestEvent(
+                        this, event.getEncounterId(), orderId,
+                        "危急值触发自动停嘱: " + event.getTestItem(), "Chain4-Chain2"));
+            }
         }, 3);
     }
+
+    private List<Long> findRelatedOrders(Long encounterId, Long patientId) {
+        // ponytail: stub — 实际实现需查询医嘱表中与该就诊关联的有效医嘱
+        // TODO: 接入 IOrderService 或医嘱服务，按 encounterId 查询有效医嘱
+        log.warn("Chain4-Chain2 linkage: findRelatedOrders not yet implemented, encounterId={}", encounterId);
+        return new ArrayList<>();
+    }
 }