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/en/label.php

@@ -144,6 +144,10 @@ return [
                 'size_normal' => 'Normal',
                 'size_compact' => 'Compact',
             ],
+            'attendance' => [
+                'enabled' => 'Require captcha for attendance check-in',
+                'enabled_help' => 'When enabled, members must solve the captcha before signing in.',
+            ],
         ],
         'meilisearch' => [
             'tab_header' => 'Meilisearch',