feat(attendance): make captcha requirement configurable

- add Filament toggle to control whether attendance check-in requires captcha
- persist the toggle under captcha.attendance.enabled with sensible defaults

Signed-off-by: Qi HU <github@spcsky.com>

resources/lang/zh_CN/label.php

@@ -185,6 +185,10 @@ return [
                 'size_normal' => '普通',
                 'size_compact' => '紧凑',
             ],
+            'attendance' => [
+                'enabled' => '启用签到验证码',
+                'enabled_help' => '开启后，用户每天签到前必须完成验证码验证。',
+            ],
         ],
         'meilisearch' => [
             'tab_header' => 'Meilisearch',