feat: enforce canonical container identity across regions

common-event-contract/src/test/java/com/baiyue/common/event/OverseasContainerUnloadedV1Test.java

@@ -7,20 +7,28 @@ import org.junit.jupiter.api.Test;
 import java.time.Instant;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 class OverseasContainerUnloadedV1Test {
     private final ObjectMapper mapper = new ObjectMapper().registerModule(new JavaTimeModule());
 
     @Test
     void payloadRoundTripsWithStableContainerIdAndUtcFacts() throws Exception {
-        var payload = new OverseasContainerUnloadedV1("1001", "MSCU1234567",
+        var payload = new OverseasContainerUnloadedV1("1001", "ZCSU7881970",
             Instant.parse("2026-08-20T03:00:00Z"), Instant.parse("2026-08-20T02:30:00Z"), null);
 
         String json = mapper.writeValueAsString(payload);
 
         assertThat(mapper.readValue(json, OverseasContainerUnloadedV1.class)).isEqualTo(payload);
-        assertThat(json).contains("sourceContainerBookingId", "1001", "MSCU1234567", "unloadingPhotoUploadedAt");
+        assertThat(json).contains("sourceContainerBookingId", "1001", "ZCSU7881970", "unloadingPhotoUploadedAt");
         assertThat(payload.unloadingCompletedAt()).isAfter(payload.unloadingPhotoUploadedAt());
         assertThat(payload.unloadingCompletedAt()).isNotEqualTo(payload.unloadingPhotoUploadedAt());
     }
+
+    @Test
+    void rejectsContainerNumberDriftBeforeDomesticConsumption() {
+        assertThatThrownBy(() -> new OverseasContainerUnloadedV1("1001", "zcsu7881970",
+            Instant.parse("2026-08-20T03:00:00Z"), Instant.parse("2026-08-20T02:30:00Z"), null))
+            .hasMessageContaining("normalized");
+    }
 }