fix(firstleg): reuse running preload lifecycle

firstleg/src/main/java/com/baiyue/firstleg/split/service/SplitPreloadService.java

@@ -83,13 +83,20 @@ public class SplitPreloadService {
     }
 
     private void ensureLoadingAllocationLifecycle(long tenantId, long inboundId, long operatorId,
-                                                   String operatorName, boolean allowConfirmed) {
+                                                   String operatorName, boolean running) {
         InboundSnapshot inbound = requireInbound(tenantId, inboundId);
-        requireWaitingSplit(inbound, "仅待分柜订单可以建立智能装柜预装计划");
         PreloadPlanEntity plan = repository.findPlan(tenantId, inboundId);
+        boolean waitingSplit = isWaitingSplit(inbound.processStatus());
+        boolean loading = "LOADING".equals(inbound.processStatus());
+        if (!waitingSplit && !(running && loading)) {
+            throw new BizException(ResultCode.CONFLICT, "仅待分柜订单可以建立智能装柜预装计划");
+        }
+        if (loading && plan == null) {
+            throw new BizException(ResultCode.CONFLICT, "装柜中的订单缺少既有预装计划，不能新增分配");
+        }
         if (plan != null) {
             if (!PreloadStatus.PENDING.equals(plan.getStatus())
-                && !(allowConfirmed && PreloadStatus.CONFIRMED.equals(plan.getStatus()))) {
+                && !(running && PreloadStatus.CONFIRMED.equals(plan.getStatus()))) {
                 throw new BizException(ResultCode.CONFLICT, "预装计划已进入确认流程，不能修改智能装柜分配");
             }
             return;