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EnakPoint & EnakCoin PRD and tasks note what is superseded.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/router/router_test.go

@@ -37,7 +37,6 @@ func TestAllRoutesRegister(t *testing.T) {
 		"GET /api/v1/marketing/loyalty-settings",
 		"PUT /api/v1/marketing/loyalty-settings",
 		"GET /api/v1/marketing/loyalty-settings/history",
-		"POST /api/v1/customer/wallet/payment-code",
 		"GET /api/v1/customer/wallet/exchange/preview",
 		"POST /api/v1/customer/wallet/exchange",
 		"GET /api/v1/customer/wallet/transfer/recipient",
@@ -47,8 +46,6 @@ func TestAllRoutesRegister(t *testing.T) {
 		"GET /api/v1/customer/outlets",
 		"GET /api/v1/customer/orders",
 		"GET /api/v1/customer/orders/:id",
-		"GET /api/v1/orders/:id/point-payment/preview",
-		"POST /api/v1/customer/orders/:id/pay-with-points",
 		"GET /api/v1/customer/pin/status",
 		"POST /api/v1/customer/pin/otp",
 		"POST /api/v1/customer/pin",
@@ -59,4 +56,13 @@ func TestAllRoutesRegister(t *testing.T) {
 	} {
 		assert.True(t, registered[want], want)
 	}
+
+	// EnakPoint cannot pay for orders (docs/enakgame-prd.md §3.2).
+	for _, gone := range []string{
+		"POST /api/v1/customer/wallet/payment-code",
+		"GET /api/v1/orders/:id/point-payment/preview",
+		"POST /api/v1/customer/orders/:id/pay-with-points",
+	} {
+		assert.False(t, registered[gone], gone)
+	}
 }