feat(payment): add GET /api/v1/my/payments for the logged-in user

Add PaymentRepository::findByUser/countByUser and a paginated
my/payments endpoint that returns the authenticated user's own payments
(derived from the token, never a userId in the URL). Public dashboard's
transactions tab can now list payments instead of hitting a nonexistent
route.

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

src/Payment/Repository/PaymentRepository.php

@@ -2,6 +2,7 @@
 
 namespace App\Payment\Repository;
 
+use App\Auth\Entity\User;
 use App\Payment\Entity\Payment;
 use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
 use Doctrine\Persistence\ManagerRegistry;
@@ -18,6 +19,35 @@ class PaymentRepository extends ServiceEntityRepository
         return $this->findOneBy(['uuid' => $uuid]);
     }
 
+    /** @return Payment[] */
+    public function findByUser(User $user, ?string $status = null, int $page = 1, int $limit = 20): array
+    {
+        $qb = $this->createQueryBuilder('p')
+            ->where('p.user = :user')->setParameter('user', $user)
+            ->orderBy('p.createdAt', 'DESC')
+            ->setFirstResult(($page - 1) * $limit)
+            ->setMaxResults($limit);
+
+        if ($status !== null) {
+            $qb->andWhere('p.status = :status')->setParameter('status', $status);
+        }
+
+        return $qb->getQuery()->getResult();
+    }
+
+    public function countByUser(User $user, ?string $status = null): int
+    {
+        $qb = $this->createQueryBuilder('p')
+            ->select('COUNT(p.id)')
+            ->where('p.user = :user')->setParameter('user', $user);
+
+        if ($status !== null) {
+            $qb->andWhere('p.status = :status')->setParameter('status', $status);
+        }
+
+        return (int) $qb->getQuery()->getSingleScalarResult();
+    }
+
     public function findByOrderId(string $orderId): ?Payment
     {
         return $this->findOneBy(['orderId' => $orderId]);