feat(loyalty): remove paying with EnakPoint

EnakPoint can only be redeemed for vouchers now: it can no longer pay for
orders and is never cashed out (docs/enakgame-prd.md §3.2, EG-001,
EG-002). No order was ever paid with EnakPoint, so there is no data to
move.

Removed:
- POST /customer/wallet/payment-code, POST /customer/orders/:id/pay-with-points
  and GET /orders/:id/point-payment/preview, with their processors,
  repositories, services, handlers and tests.
- The point payment method type: paying, splitting and refunding with it,
  the outlet filter on the method list, and the system-method guard.
- points and payment_code on CreatePayment; points_used and point_value
  on payments; accepts_point_payment on the customer outlets.
- The outlet point_payment settings. A PUT that still sends them is
  rejected as an unknown field.
- The EnakPoint split in the payment method analytics.
- PAYMENT and PAYMENT_REFUND from the wallet type rules. Tests that used
  them as a generic EnakPoint debit use REWARD_REDEEM.
- The EnakPoint-paid part from the earning basis, which is
  subtotal − discount again.

Migration 000102 drops the trigger, the point methods and their index,
the payments columns, and the outlet settings, and restores the method
type CHECK without point. payments.payment_method_id is ON DELETE
RESTRICT, so it fails rather than lose a payment made with EnakPoint.

The integration docs list the removed endpoints and fields, and the
EnakPoint & EnakCoin PRD and tasks note what is superseded.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/repository/customer_order_repository.go

@@ -62,8 +62,6 @@ type CustomerOrderPaymentRow struct {
 	Amount       float64
 	Status       string
 	RefundAmount float64
-	PointsUsed   *int64
-	PointValue   *float64
 	CreatedAt    time.Time
 }
 
@@ -145,7 +143,7 @@ func (r *customerOrderRepository) ListPayments(ctx context.Context, orderID uuid
 	var rows []CustomerOrderPaymentRow
 	err := DBFromContext(ctx, r.db).WithContext(ctx).Raw(`
 		SELECT pay.id, COALESCE(pm.name, '') AS method_name, COALESCE(pm.type, '') AS method_type,
-			pay.amount, pay.status, pay.refund_amount, pay.points_used, pay.point_value, pay.created_at
+			pay.amount, pay.status, pay.refund_amount, pay.created_at
 		FROM payments pay
 		LEFT JOIN payment_methods pm ON pm.id = pay.payment_method_id
 		WHERE pay.order_id = ?