Add wallet auto-withdraw threshold support for Ladill Mini.

Store per-user auto-withdraw amounts, expose them via the wallet API, and process withdrawals when balances reach the configured threshold after payments or on a schedule.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Models/QrSetting.php

@@ -17,6 +17,7 @@ class QrSetting extends Model
         'low_balance_alerts',
         'notify_registrations',
         'notify_payouts',
+        'auto_withdraw_amount_minor',
         'default_type',
         'default_style',
         'event_defaults',
@@ -27,6 +28,7 @@ class QrSetting extends Model
         'low_balance_alerts' => 'boolean',
         'notify_registrations' => 'boolean',
         'notify_payouts' => 'boolean',
+        'auto_withdraw_amount_minor' => 'integer',
         'default_style' => 'array',
         'event_defaults' => 'array',
     ];