test: freeze server-filtered booking candidates

firstleg/src/test/java/com/baiyue/firstleg/oceanbooking/controller/PlatformOceanBookingControllerContractTest.java

@@ -71,7 +71,10 @@ class PlatformOceanBookingControllerContractTest {
             .contains("warehouseId", "channelCode", "containerType")
             .contains("LinkCandidateResponse", "requiredQuantity", "allocatedQuantity", "remainingQuantity")
             .contains("Capacity and max weight are derived display snapshots and never eligibility fields")
-            .contains("booking detail calls are not used");
+            .contains("Returns only linkable requirement candidates")
+            .contains("An empty result is a normal successful page")
+            .contains("booking detail calls are not used")
+            .doesNotContain("mismatchReasons", "disabledReason");
     }
 
     @Test

firstleg/src/test/java/com/baiyue/firstleg/oceanbooking/service/OceanBookingServiceTest.java

@@ -210,6 +210,21 @@ class OceanBookingServiceTest {
         verify(repository, never()).containers(anyLong());
     }
 
+    @Test
+    void linkCandidatesReturnsNormalEmptyPageWithOneSetQueryAndNoDiagnosticFields() {
+        when(repository.linkCandidates(any())).thenReturn(new PageResult<>(List.of(), 1, 20, 0, 0));
+
+        PageResult<LinkCandidate> result = service.linkCandidates(
+            new LinkCandidateQuery(701L, "SEA-US", "45HC", null, null));
+
+        assertThat(result.records()).isEmpty();
+        assertThat(result.total()).isZero();
+        assertThat(result.pages()).isZero();
+        verify(repository, times(1)).linkCandidates(any());
+        assertThat(LinkCandidate.class.getRecordComponents()).extracting(java.lang.reflect.RecordComponent::getName)
+            .doesNotContain("mismatchReasons", "disabledReason", "warehouseId", "channelCode");
+    }
+
     @Test
     void releaseRejectsInvalidScheduleWithoutTransition() {
         OceanBookingEntity draft = completeBooking("DRAFT", 3);