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EnakPoint & EnakCoin PRD and tasks note what is superseded.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>

migrations/000102_remove_point_payment_method.up.sql

@@ -0,0 +1,25 @@
+-- EnakPoint can no longer pay for orders: it can only be redeemed for vouchers
+-- (docs/enakgame-prd.md §3.2). Undoes 000094 and the point type 000098 kept.
+
+DROP TRIGGER IF EXISTS trigger_create_point_payment_method ON organizations;
+DROP FUNCTION IF EXISTS create_point_payment_method();
+
+-- payments.payment_method_id is ON DELETE RESTRICT, so this fails if any payment was
+-- made with EnakPoint instead of silently losing it. None was (2026-10-07).
+DELETE FROM payment_methods WHERE type = 'point';
+DROP INDEX IF EXISTS uq_payment_methods_point_per_organization;
+
+ALTER TABLE payment_methods DROP CONSTRAINT IF EXISTS payment_methods_type_check;
+ALTER TABLE payment_methods ADD CONSTRAINT payment_methods_type_check
+    CHECK (type IN ('cash', 'card', 'digital_wallet', 'qr', 'edc', 'delivery'));
+
+ALTER TABLE payments
+    DROP CONSTRAINT IF EXISTS chk_payments_point_pair,
+    DROP COLUMN IF EXISTS points_used,
+    DROP COLUMN IF EXISTS point_value;
+
+-- The outlet settings that switched it on. Their history in loyalty_setting_changes stays.
+DELETE FROM outlet_settings WHERE key IN (
+    'loyalty.point.accept_payment',
+    'loyalty.point.min_payment_points',
+    'loyalty.point.max_payment_percent');