fix(firstleg): reuse source manifest within work fact batches

firstleg/src/test/java/com/baiyue/firstleg/portschedule/service/AppointmentWorkSourceServiceTest.java

@@ -7,6 +7,8 @@ import org.junit.jupiter.api.Test;
 import org.springframework.web.server.ResponseStatusException;
 import java.time.LocalDateTime;
 import java.util.List;
+import java.util.stream.IntStream;
+import com.baiyue.firstleg.portschedule.dto.AppointmentWorkSourceDtos.*;
 import static org.mockito.Mockito.*;
 import static org.junit.jupiter.api.Assertions.*;
 
@@ -42,4 +44,32 @@ class AppointmentWorkSourceServiceTest {
         assertEquals(401,assertThrows(ResponseStatusException.class,()->guarded.discover(null,null,20)).getStatusCode().value());
         verifyNoInteractions(mapper);
     }
+    @Test void factBatchReadsManifestOnceAndPreservesEachContainerIdentity() {
+        when(mapper.sources()).thenReturn(IntStream.rangeClosed(1,100).mapToObj(id->source(id,1)).toList());
+        when(mapper.cargo(anyLong())).thenReturn(List.of());
+        var fact=mock(Fact.class);
+        when(facts.read(any(),any())).thenAnswer(invocation->{
+            FactRequest request=invocation.getArgument(0); ContainerSource source=invocation.getArgument(1);
+            assertEquals(request.containerBookingId(),source.containerBookingId());
+            return fact;
+        });
+        var requests=IntStream.rangeClosed(1,100).boxed().flatMap(id->List.of(
+            request("PICKUP-"+id,"PICKUP",id),request("RETURN-"+id,"EMPTY_RETURN",id)).stream()).toList();
+        assertEquals(200,service.facts(requests).size());
+        verify(mapper,times(1)).sources();
+        for(long id=1;id<=100;id++) verify(mapper,times(1)).cargo(id);
+        verify(facts,times(200)).read(any(),any());
+    }
+    @Test void nextFactBatchReadsFreshManifestAndRejectsRemovedContainer() {
+        when(mapper.sources()).thenReturn(List.of(source(1,1)),List.of());
+        when(mapper.cargo(1)).thenReturn(List.of());
+        var request=request("PICKUP-1","PICKUP",1);
+        service.facts(List.of(request));
+        assertEquals(404,assertThrows(ResponseStatusException.class,()->service.facts(List.of(request))).getStatusCode().value());
+        verify(mapper,times(2)).sources();
+        verify(facts,times(1)).read(any(),any());
+    }
+    private FactRequest request(String key,String type,long id) {
+        return new FactRequest(key,type,"TRANSIT",Long.toString(id),null,null,null,List.of(),List.of(),List.of());
+    }
 }