fix(firstleg): restore smart loading candidate projection

firstleg/src/test/java/com/baiyue/firstleg/repository/SmartLoadingCandidateMapperContractTest.java

@@ -43,6 +43,10 @@ class SmartLoadingCandidateMapperContractTest {
             .contains("SELECT SUM(li.package_count)")
             .contains("li.deleted=0")
             .contains("ORDER BY o.inbounded_at ASC, o.id ASC, i.inbound_detail_id ASC");
+
+        assertThat(sql.indexOf("NULL blockReason"))
+            .as("record constructor projection must keep status fields in their trailing positions")
+            .isLessThan(sql.indexOf("o.order_status_snapshot orderStatusSnapshot"));
     }
 
     @Test
@@ -72,6 +76,10 @@ class SmartLoadingCandidateMapperContractTest {
             .contains("SUM(package_count) package_count")
             .contains("GROUP BY tenant_id,measurement_id,inbound_detail_id")
             .contains("FOR UPDATE");
+
+        assertThat(sql.indexOf("NULL blockReason"))
+            .as("record constructor projection must keep status fields in their trailing positions")
+            .isLessThan(sql.indexOf("o.order_status_snapshot orderStatusSnapshot"));
     }
 
     @Test