fix:EsignAuditLog 생성 시 tenant_id 누락 수정

모델 $fillable에 tenant_id 추가, 컨트롤러의 감사 로그 생성 3곳
(contract_created, contract_cancelled, sign_request_sent) 모두
tenant_id를 포함하도록 수정.

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

app/Http/Controllers/ESign/EsignApiController.php

@@ -149,6 +149,7 @@ public function store(Request $request): JsonResponse
 
         // 감사 로그
         EsignAuditLog::create([
+            'tenant_id' => $tenantId,
             'contract_id' => $contract->id,
             'action' => 'contract_created',
             'ip_address' => $request->ip(),
@@ -182,6 +183,7 @@ public function cancel(Request $request, int $id): JsonResponse
         ]);
 
         EsignAuditLog::create([
+            'tenant_id' => $tenantId,
             'contract_id' => $contract->id,
             'action' => 'contract_cancelled',
             'ip_address' => $request->ip(),
@@ -260,6 +262,7 @@ public function send(Request $request, int $id): JsonResponse
         }
 
         EsignAuditLog::create([
+            'tenant_id' => $tenantId,
             'contract_id' => $contract->id,
             'action' => 'sign_request_sent',
             'ip_address' => $request->ip(),

app/Models/ESign/EsignAuditLog.php

@@ -12,6 +12,7 @@ class EsignAuditLog extends Model
     public $timestamps = false;
 
     protected $fillable = [
+        'tenant_id',
         'contract_id',
         'signer_id',
         'action',