feat: [barobill] 독립 SMS API 연동 및 OTP 발송 전환

- BarobillService에 SMS WSDL 엔드포인트 추가
- sendSMSMessage, checkSMSFromNumber, getSMSFromNumbers 메서드 추가
- sendOtpViaSms를 알림톡 대체발송 → 독립 SMS API(SendSMSMessage)로 전환

app/Http/Controllers/ESign/EsignPublicController.php

@@ -614,7 +614,7 @@ public function downloadDocument(string $token): StreamedResponse|JsonResponse
     // ─── Private ───
 
     /**
-     * SMS로 OTP 발송 (바로빌 알림톡 SMS 대체발송 기능 활용)
+     * SMS로 OTP 발송 (바로빌 독립 SMS API 사용)
      */
     private function sendOtpViaSms(EsignContract $contract, EsignSigner $signer, string $otpCode): bool
     {
@@ -632,31 +632,17 @@ private function sendOtpViaSms(EsignContract $contract, EsignSigner $signer, str
             $barobill = app(BarobillService::class);
             $barobill->setServerMode($member->server_mode ?? 'production');
 
-            // 채널 ID 조회
-            $channelResult = $barobill->getKakaotalkChannels($member->biz_no);
-            $yellowId = '';
-            if ($channelResult['success'] ?? false) {
-                $chData = $channelResult['data'];
-                if (is_object($chData) && isset($chData->KakaotalkChannel)) {
-                    $ch = is_array($chData->KakaotalkChannel) ? $chData->KakaotalkChannel[0] : $chData->KakaotalkChannel;
-                    $yellowId = $ch->ChannelId ?? '';
-                }
-            }
-
+            $fromNumber = preg_replace('/[^0-9]/', '', $member->manager_hp);
+            $toNumber = preg_replace('/[^0-9]/', '', $signer->phone);
             $smsText = "[SAM] 전자계약 인증코드: {$otpCode} (5분 이내 입력)";
 
-            $result = $barobill->sendATKakaotalkEx(
+            $result = $barobill->sendSMSMessage(
                 corpNum: $member->biz_no,
                 senderId: $member->barobill_id,
-                yellowId: $yellowId,
-                templateName: '인증코드',
-                receiverName: $signer->name,
-                receiverNum: preg_replace('/[^0-9]/', '', $signer->phone),
-                title: '',
-                message: $smsText,
-                buttons: [],
-                smsMessage: $smsText,
-                smsSenderNum: preg_replace('/[^0-9]/', '', $member->manager_hp),
+                fromNumber: $fromNumber,
+                toName: $signer->name,
+                toNumber: $toNumber,
+                contents: $smsText,
             );
 
             if ($result['success'] ?? false) {