fix(fleet): compare customer identities without collation conflicts

lastleg-service/src/main/java/com/baiyue/lastleg/fleet/trip/VehicleFulfillmentMapper.java

@@ -11,7 +11,7 @@ public interface VehicleFulfillmentMapper {
     String DEPARTED = "EXISTS (SELECT 1 FROM ll_fleet_trip_history h WHERE h.trip_id=t.id AND h.action='DEPART' "
         + "AND JSON_UNQUOTE(JSON_EXTRACT(h.snapshot_json,'$.trip.vehicleId'))=#{vehicleKey})";
     String DELIVERIES = " FROM ll_delivery_order d JOIN ll_fleet_trip_dispatch b "
-        + "ON b.dispatch_id=d.dispatch_order_id AND b.customer_id=d.customer_id "
+        + "ON b.dispatch_id=d.dispatch_order_id AND CAST(b.customer_id AS BINARY(128))=CAST(d.customer_id AS BINARY(128)) "
         + "JOIN ll_fleet_trip t ON t.id=b.trip_id WHERE ((t.status='PLANNED' AND t.vehicle_id=#{vehicleId}) OR " + DEPARTED + ")";
     String PREVIOUS_VEHICLE = "JSON_UNQUOTE(JSON_EXTRACT(p.snapshot_json,'$.trip.vehicleId'))";
     String NEXT_VEHICLE = "JSON_UNQUOTE(JSON_EXTRACT(h.snapshot_json,'$.trip.vehicleId'))";

lastleg-service/src/test/java/com/baiyue/lastleg/fleet/trip/VehicleFulfillmentQueryTest.java

@@ -59,6 +59,8 @@ public class VehicleFulfillmentQueryTest {
     }
     @Test void currentPlanUsesStableVehicleIdentityAndCustomerScopedDispatchJoin() {
         delivery(23,11,"WRONG-CUSTOMER");
+        delivery(24,11,"CUSTOMER-A-OTHER");
+        delivery(25,11,"customer-a");
         var result = service.deliveries(8,new VehicleFulfillmentModels.Query(1,10));
         assertThat(result.total()).isEqualTo(2);
         assertThat(result.records()).extracting(VehicleFulfillmentModels.Delivery::customerName).containsExactly("CUSTOMER-B","CUSTOMER-A");