fix:계약 생성 상대방 전화번호 고정값으로 변경

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

resources/views/esign/create.blade.php

@@ -346,7 +346,7 @@ className={`flex items-center gap-1.5 ${i + 1 < currentStep ? 'cursor-pointer' :
             creator_phone: '02-6347-0005',
             counterpart_name: pick(lastNames) + pick(firstNames),
             counterpart_email: 'awesomemyword@gmail.com',
-            counterpart_phone: rPhone(),
+            counterpart_phone: '010-5123-8210',
         }));
     };