fix(sports): complete registration when subscription is paid

handleSubscriptionPaid() now finds the player's assessed registration
and marks it as completed (payment_status='paid', status='completed').
Previously, paying the subscription only updated sa_subscriptions but
never flowed back to sa_registrations, leaving the wizard card button
permanently disabled.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Modules/SportsActivity/Services/SaEventListenerService.php

@@ -137,6 +137,8 @@ final class SaEventListenerService
     private static function handleSubscriptionPaid(array $data): void
     {
         $db = App::getInstance()->db();
+        $subscriptionId = (int) ($data['related_entity_id'] ?? 0);
+
         $db->update('sa_subscriptions', [
             'payment_status' => SaConstants::PAYMENT_PAID,
             'paid_at'        => date('Y-m-d H:i:s'),
@@ -145,7 +147,26 @@ final class SaEventListenerService
             'receipt_id'     => $data['receipt_id'] ?? null,
             'receipt_number' => $data['receipt_number'] ?? null,
             'updated_at'     => date('Y-m-d H:i:s'),
-        ], 'id = ?', [(int) ($data['related_entity_id'] ?? 0)]);
+        ], 'id = ?', [$subscriptionId]);
+
+        $sub = $db->selectOne(
+            "SELECT player_id FROM sa_subscriptions WHERE id = ?",
+            [$subscriptionId]
+        );
+        if ($sub) {
+            $reg = $db->selectOne(
+                "SELECT id FROM sa_registrations WHERE player_id = ? AND status = 'assessed' AND payment_status = 'unpaid' ORDER BY id DESC LIMIT 1",
+                [(int) $sub['player_id']]
+            );
+            if ($reg) {
+                $db->update('sa_registrations', [
+                    'payment_status' => SaConstants::PAYMENT_PAID,
+                    'status'         => 'completed',
+                    'completed_at'   => date('Y-m-d H:i:s'),
+                    'updated_at'     => date('Y-m-d H:i:s'),
+                ], 'id = ?', [(int) $reg['id']]);
+            }
+        }
     }
 
     private static function handleBookingPaid(array $data): void