feat: 카드 결제 알림 자동인식(미확인 내역) 백엔드

- account_entry pending/notif_key 컬럼 추가(멱등 마이그레이션)
- CardNotificationParser: 카드사·금액·가맹점·승인/취소 파싱
- POST /entries/notification(미확인 지출 생성, 중복방지, 카드 자동매칭)
- POST /entries/{id}/confirm(확정), GET /entries/pending/count

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/main/java/com/sb/web/account/dto/AccountEntryResponse.java

@@ -25,6 +25,7 @@ public class AccountEntryResponse {
     private Long toWalletId;
     private String toWalletName;
     private Integer installmentMonths;
+    private Boolean pending;
     private List<String> tags;
 
     public static AccountEntryResponse from(AccountEntry e, List<String> tags) {
@@ -40,6 +41,7 @@ public class AccountEntryResponse {
                 .toWalletId(e.getToWalletId())
                 .toWalletName(e.getToWalletName())
                 .installmentMonths(e.getInstallmentMonths())
+                .pending(Boolean.TRUE.equals(e.getPending()))
                 .tags(tags)
                 .build();
     }