feat: 문의사항에 '답변 완료' 상태 추가

의견 처리 상태 셀렉트박스에 '답변 완료'(answered) 옵션을 추가하고
목록 배지 색상(teal)을 지정한다. fb_status는 VARCHAR라 DB 변경 불필요.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/Views/admin/feedback/all.php

@@ -14,6 +14,7 @@ $badge = static function (string $s): string {
     $map = [
         'new'         => 'bg-blue-50 text-blue-700',
         'in_progress' => 'bg-amber-50 text-amber-700',
+        'answered'    => 'bg-teal-50 text-teal-700',
         'done'        => 'bg-emerald-50 text-emerald-700',
         'hold'        => 'bg-gray-100 text-gray-500',
     ];

app/Views/admin/feedback/index.php

@@ -12,6 +12,7 @@ $badge = static function (string $s): string {
     $map = [
         'new'         => 'bg-blue-50 text-blue-700',
         'in_progress' => 'bg-amber-50 text-amber-700',
+        'answered'    => 'bg-teal-50 text-teal-700',
         'done'        => 'bg-emerald-50 text-emerald-700',
         'hold'        => 'bg-gray-100 text-gray-500',
     ];