feat(sanctions): expose the loaded list's data-currency date on every screening result

Screening only ever told a caller whether a name matched and when the
check ran — not which dated snapshot of the UN Security Council list it
ran against. Added SanctionsEntryRepository.findListLastLoadedOn()
(MAX(createdDate) over active entries) and threaded it through
SanctionsScreeningResult as listDataAsOf, so the frontend can show "List
Data As Of: <date>" alongside "Screened On".

fineract-core/src/main/java/org/apache/fineract/portfolio/sanctions/domain/SanctionsEntryRepository.java

@@ -18,7 +18,9 @@
  */
 package org.apache.fineract.portfolio.sanctions.domain;
 
+import java.time.OffsetDateTime;
 import java.util.List;
+import java.util.Optional;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
@@ -40,4 +42,11 @@ public interface SanctionsEntryRepository extends JpaRepository<SanctionsEntry,
     void deleteAllByActiveTrue();
 
     long countByActiveTrue();
+
+    /**
+     * Timestamp the active sanctions list was last loaded into the database — i.e. the data
+     * currency shown to callers so they know which list snapshot a screening ran against.
+     */
+    @Query("SELECT MAX(s.createdDate) FROM SanctionsEntry s WHERE s.active = true")
+    Optional<OffsetDateTime> findListLastLoadedOn();
 }