fix: 설정 수정 시 params/fields unique 제약 위반 수정

Hibernate가 INSERT를 DELETE보다 먼저 실행하는 문제 해결.
clear() 후 entityManager.flush()로 DELETE를 먼저 실행

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/main/java/com/snp/batch/service/BypassConfigService.java

@@ -8,6 +8,7 @@ import com.snp.batch.global.model.BypassApiConfig;
 import com.snp.batch.global.model.BypassApiField;
 import com.snp.batch.global.model.BypassApiParam;
 import com.snp.batch.global.repository.BypassApiConfigRepository;
+import jakarta.persistence.EntityManager;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
@@ -25,6 +26,7 @@ import java.util.List;
 public class BypassConfigService {
 
     private final BypassApiConfigRepository configRepository;
+    private final EntityManager entityManager;
 
     /**
      * 설정 목록 조회
@@ -101,8 +103,11 @@ public class BypassConfigService {
         config.setResponseType(request.getResponseType());
         config.setDescription(request.getDescription());
 
-        // params 교체 (orphanRemoval로 기존 자동 삭제)
+        // params/fields 교체: clear → flush(DELETE 실행) → 새로 추가
         config.getParams().clear();
+        config.getFields().clear();
+        entityManager.flush();
+
         if (request.getParams() != null) {
             request.getParams().forEach(p -> {
                 BypassApiParam param = toParamEntity(p);
@@ -111,8 +116,6 @@ public class BypassConfigService {
             });
         }
 
-        // fields 교체
-        config.getFields().clear();
         if (request.getFields() != null) {
             request.getFields().forEach(f -> {
                 BypassApiField field = toFieldEntity(f);