perf(lastleg): reuse warehouse directory within sync generation

lastleg-service/src/main/java/com/baiyue/lastleg/inboundplan/work/AppointmentWorkRequirementProvider.java

@@ -20,8 +20,22 @@ public class AppointmentWorkRequirementProvider implements AppointmentWorkFactGa
     public AppointmentWorkRequirementProvider(AppointmentSourceService sources,AppointmentCargoVerificationService cargo,InboundFbaAppointmentService appointments,AppointmentWorkSourceMapper sourceMapping) {
         this.sources=sources; this.cargo=cargo; this.appointments=appointments; this.sourceMapping=sourceMapping;
     }
+    /** 同次生成仅共享按需读取的目录；原业务数据继续逐需求核实。 */
+    public RequirementReader openRequirements() {
+        return new RequirementReader() {
+            private AppointmentSourceService.ReadScope scope;
+            /** 直送和未建立尾程来源的需求不创建目录读取依赖。 */
+            public List<Requirement> read(ContainerSource container,Flow flow) {
+                return requirements(container,flow,refs->{
+                    if(scope==null) scope=sources.openReadScope();
+                    return scope.resolveBatch(refs);
+                });
+            }
+        };
+    }
     /** 按当前实物分配生成客户需求，保留已撤销批次身份以退役旧事项。 */
-    public List<Requirement> requirements(ContainerSource container,Flow effectiveFlow) {
+    private List<Requirement> requirements(ContainerSource container,Flow effectiveFlow,
+        java.util.function.Function<List<AppointmentCoverageService.SourceRef>,List<AppointmentSourceService.Source>> resolver) {
         var original=container.requirements().stream().map(r->"PRIVATE".equals(r.destinationKind())?new Requirement(r.requirementKey(),r.batchKey(),r.batchNo(),"CUSTOMER",r.originName(),r.destinationName(),r.timezone(),r.references(),r.replacesRequirementKeys(),r.sources()):r).toList();
         if(effectiveFlow==Flow.DIRECT) return original;
         if(effectiveFlow!=Flow.TRANSFER) throw conflict("需求清单必须明确有效作业路线");
@@ -38,7 +52,7 @@ public class AppointmentWorkRequirementProvider implements AppointmentWorkFactGa
             if(!"FBA".equals(requirement.destinationKind())) { result.put(requirement.requirementKey(),requirement); continue; }
             var refs=canonical(sourceOrders.stream().map(s->new SourceReference(s.customerId(),"ORDER:"+s.id(),null)).toList());
             List<AppointmentSourceService.Source> resolved;
-            try { resolved=sources.resolveBatch(refs); }
+            try { resolved=resolver.apply(refs); }
             catch(org.springframework.web.server.ResponseStatusException error) {
                 if(!AppointmentWorkSourceAvailability.unresolved(error)) throw error;
                 // Keep the complete physical obligation and its canonical source identities. The fact