refactor: DB 조회 방법 개선

src/main/java/com/first/flash/version/application/VersionService.java

@@ -1,6 +1,6 @@
 package com.first.flash.version.application;
 
-import com.first.flash.version.domain.AppVersion;
+import java.util.NoSuchElementException;
 import com.first.flash.version.infrastructure.VersionJpaRepository;
 import com.first.flash.version.application.dto.VersionResponseDto;
 import lombok.RequiredArgsConstructor;
@@ -15,7 +15,8 @@ public class VersionService {
     private final VersionJpaRepository versionJpaRepository;
 
     public VersionResponseDto getLatestVersions() {
-        AppVersion version = versionJpaRepository.findAll().get(0);
-        return new VersionResponseDto(version.getAndroid(), version.getIos());
+        return versionJpaRepository.findTopByOrderByIdDesc()
+                                   .map(version -> new VersionResponseDto(version.getAndroid(), version.getIos()))
+                                   .orElseThrow(() -> new NoSuchElementException("No version information available"));
     }
 }

src/main/java/com/first/flash/version/infrastructure/VersionJpaRepository.java

@@ -1,10 +1,10 @@
 package com.first.flash.version.infrastructure;
 
 import com.first.flash.version.domain.AppVersion;
-import java.util.List;
 import org.springframework.data.jpa.repository.JpaRepository;
+import java.util.Optional;
 
 public interface VersionJpaRepository extends JpaRepository<AppVersion, Long> {
 
-    List<AppVersion> findAll();
+    Optional<AppVersion> findTopByOrderByIdDesc();
 }