fix:E-Sign 알림톡 certKey 버그 수정 및 발송 상태 추적 기능 추가

- sendATKakaotalkEx() 호출 시 존재하지 않는 certKey 파라미터 제거 (TypeError 버그)
- sendAlimtalk/dispatchNotification 결과 반환 (void → array)
- send/remind 응답에 notification_results 포함
- 감사 로그 metadata에 서명자별 알림 발송 결과 저장
- EsignPublicController 다음 서명자/완료 알림에도 동일 수정 적용
- detail.blade.php: 발송 방식 배지, 서명자 연락처, 알림 오류 배너, 활동 로그 발송 결과 표시
- send.blade.php: 발송 후 알림 실패 시 경고 메시지 표시

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Http/Controllers/ESign/EsignApiController.php

@@ -712,9 +712,15 @@ public function send(Request $request, int $id): JsonResponse
             $targetSigners = $first ? collect([$first]) : collect();
         }
 
+        $notificationResults = [];
         foreach ($targetSigners as $signer) {
             $signer->update(['status' => 'notified']);
-            $this->dispatchNotification($contract, $signer, $sendMethod, $smsFallback);
+            $results = $this->dispatchNotification($contract, $signer, $sendMethod, $smsFallback);
+            $notificationResults[] = [
+                'signer_id' => $signer->id,
+                'signer_name' => $signer->name,
+                'results' => $results,
+            ];
         }
 
         EsignAuditLog::create([
@@ -723,11 +729,34 @@ public function send(Request $request, int $id): JsonResponse
             'action' => 'sign_request_sent',
             'ip_address' => $request->ip(),
             'user_agent' => $request->userAgent(),
-            'metadata' => ['sent_by' => auth()->id(), 'send_method' => $sendMethod],
+            'metadata' => [
+                'sent_by' => auth()->id(),
+                'send_method' => $sendMethod,
+                'notification_results' => $notificationResults,
+            ],
             'created_at' => now(),
         ]);
 
-        return response()->json(['success' => true, 'message' => '서명 요청이 발송되었습니다.']);
+        // 실패한 알림 확인
+        $failures = [];
+        foreach ($notificationResults as $nr) {
+            foreach ($nr['results'] as $r) {
+                if (!$r['success']) {
+                    $failures[] = "{$nr['signer_name']}: {$r['channel']} 실패 ({$r['error']})";
+                }
+            }
+        }
+
+        $message = '서명 요청이 발송되었습니다.';
+        if (!empty($failures)) {
+            $message .= ' (일부 알림 실패: ' . implode(', ', $failures) . ')';
+        }
+
+        return response()->json([
+            'success' => true,
+            'message' => $message,
+            'notification_results' => $notificationResults,
+        ]);
     }
 
     /**
@@ -748,14 +777,20 @@ public function remind(Request $request, int $id): JsonResponse
             ->orderBy('sign_order')
             ->first();
 
+        $notificationResults = [];
         if ($nextSigner) {
             $nextSigner->update(['status' => 'notified']);
-            $this->dispatchNotification(
+            $results = $this->dispatchNotification(
                 $contract, $nextSigner,
                 $contract->send_method ?? 'alimtalk',
                 $contract->sms_fallback ?? true,
                 isReminder: true,
             );
+            $notificationResults[] = [
+                'signer_id' => $nextSigner->id,
+                'signer_name' => $nextSigner->name,
+                'results' => $results,
+            ];
         }
 
         EsignAuditLog::create([
@@ -767,15 +802,32 @@ public function remind(Request $request, int $id): JsonResponse
             'metadata' => [
                 'reminded_by' => auth()->id(),
                 'target_signer_id' => $nextSigner?->id,
+                'notification_results' => $notificationResults,
             ],
             'created_at' => now(),
         ]);
 
+        // 실패 확인
+        $failures = [];
+        foreach ($notificationResults as $nr) {
+            foreach ($nr['results'] as $r) {
+                if (!$r['success']) {
+                    $failures[] = "{$r['channel']} 실패 ({$r['error']})";
+                }
+            }
+        }
+
+        $message = $nextSigner
+            ? "{$nextSigner->name}에게 리마인더가 발송되었습니다."
+            : '리마인더가 기록되었습니다.';
+        if (!empty($failures)) {
+            $message .= ' (일부 알림 실패: ' . implode(', ', $failures) . ')';
+        }
+
         return response()->json([
             'success' => true,
-            'message' => $nextSigner
-                ? "{$nextSigner->name}에게 리마인더가 발송되었습니다."
-                : '리마인더가 기록되었습니다.',
+            'message' => $message,
+            'notification_results' => $notificationResults,
         ]);
     }
 
@@ -788,18 +840,32 @@ private function dispatchNotification(
         string $sendMethod,
         bool $smsFallback,
         bool $isReminder = false,
-    ): void {
+    ): array {
+        $results = [];
+
         // 알림톡 발송
         if (in_array($sendMethod, ['alimtalk', 'both']) && $signer->phone) {
-            $this->sendAlimtalk($contract, $signer, $smsFallback, $isReminder);
+            $results[] = $this->sendAlimtalk($contract, $signer, $smsFallback, $isReminder);
         }
 
         // 이메일 발송 (email/both 선택 시, 또는 알림톡인데 번호 없으면 폴백)
         if (in_array($sendMethod, ['email', 'both']) || ($sendMethod === 'alimtalk' && !$signer->phone)) {
             if ($signer->email) {
-                Mail::to($signer->email)->send(new EsignRequestMail($contract, $signer, $isReminder));
+                try {
+                    Mail::to($signer->email)->send(new EsignRequestMail($contract, $signer, $isReminder));
+                    $results[] = ['success' => true, 'channel' => 'email', 'error' => null];
+                } catch (\Throwable $e) {
+                    \Log::warning('E-Sign 이메일 발송 실패', [
+                        'contract_id' => $contract->id,
+                        'signer_id' => $signer->id,
+                        'error' => $e->getMessage(),
+                    ]);
+                    $results[] = ['success' => false, 'channel' => 'email', 'error' => $e->getMessage()];
+                }
             }
         }
+
+        return $results;
     }
 
     /**
@@ -810,11 +876,11 @@ private function sendAlimtalk(
         EsignSigner $signer,
         bool $smsFallback = true,
         bool $isReminder = false,
-    ): void {
+    ): array {
         try {
             $member = BarobillMember::where('tenant_id', $contract->tenant_id)->first();
             if (!$member) {
-                return;
+                return ['success' => false, 'channel' => 'alimtalk', 'error' => '바로빌 회원 미등록'];
             }
 
             $barobill = app(BarobillService::class);
@@ -833,9 +899,8 @@ private function sendAlimtalk(
                 ? "[SAM] {$signer->name}님, 전자계약 서명 요청이 도착했습니다. {$signUrl}"
                 : '';
 
-            $barobill->sendATKakaotalkEx(
+            $result = $barobill->sendATKakaotalkEx(
                 corpNum: $member->corp_num,
-                certKey: $member->cert_key,
                 senderId: $member->kakaotalk_sender_id ?? '',
                 templateName: $templateName,
                 receiverName: $signer->name,
@@ -852,12 +917,24 @@ private function sendAlimtalk(
                 ],
                 smsMessage: $smsMessage,
             );
+
+            if (!($result['success'] ?? false)) {
+                \Log::warning('E-Sign 알림톡 발송 실패', [
+                    'contract_id' => $contract->id,
+                    'signer_id' => $signer->id,
+                    'error' => $result['error'] ?? 'Unknown error',
+                ]);
+                return ['success' => false, 'channel' => 'alimtalk', 'error' => $result['error'] ?? 'API 호출 실패'];
+            }
+
+            return ['success' => true, 'channel' => 'alimtalk', 'error' => null];
         } catch (\Throwable $e) {
             \Log::warning('E-Sign 알림톡 발송 실패', [
                 'contract_id' => $contract->id,
                 'signer_id' => $signer->id,
                 'error' => $e->getMessage(),
             ]);
+            return ['success' => false, 'channel' => 'alimtalk', 'error' => $e->getMessage()];
         }
     }