[fix]SMS 직접입력 발송 시 PHP 8.x Undefined array key 경고 수정

case 'h' 직접입력 항목에 bg_no, mb_id, bk_no 키 누락으로 257행에서 Warning 발생

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

adm/sms_admin/sms_write_send.php

@@ -125,7 +125,7 @@ while ($row = array_shift($send_list))
                     continue 2;
                 }
 
-                array_push($list, array('bk_hp' => $hp, 'bk_name' => $name));
+                array_push($list, array('bk_hp' => $hp, 'bk_name' => $name, 'mb_id' => '', 'bg_no' => '', 'bk_no' => ''));
                 array_push($hps, $hp);
                 break;