Mini API: avatar, wallet payout/withdraw, stale-payment auto-cancel.

Adds account avatar upload (multipart proxy to identity), wallet payout-account
+ withdrawal endpoints, and a hourly mini:cancel-stale-payments command that
cancels payments pending beyond 6h (new MiniPayment::STATUS_CANCELED).

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

routes/console.php

@@ -8,6 +8,8 @@ Artisan::command('inspire', function () {
     $this->comment(Inspiring::quote());
 })->purpose('Display an inspiring quote');
 
+Schedule::command('mini:cancel-stale-payments')->hourly()->withoutOverlapping();
+
 Schedule::command('hosting:check-node-health --all')->everyFiveMinutes()->withoutOverlapping();
 Schedule::command('hosting:sync-account-usage')->hourly()->withoutOverlapping();
 Schedule::command('hosting:recalculate-node-capacity --shared-only')->daily()->withoutOverlapping();