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EnakPoint & EnakCoin PRD and tasks note what is superseded.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/processor/payment_method_processor.go

@@ -1,10 +1,7 @@
 package processor
 
 import (
-	"apskel-pos-be/internal/constants"
-	"apskel-pos-be/internal/entities"
 	"context"
-	"errors"
 	"fmt"
 
 	"apskel-pos-be/internal/mappers"
@@ -23,26 +20,17 @@ type PaymentMethodProcessor interface {
 	GetActivePaymentMethodsByOrganization(ctx context.Context, organizationID uuid.UUID) ([]models.PaymentMethodResponse, error)
 }
 
-// ErrSystemPaymentMethod means an attempt to create, delete or retype the EnakPoint
-// method, which the system owns (docs/prd-point-coin.md F9).
-var ErrSystemPaymentMethod = errors.New("the EnakPoint payment method is managed by the system: it cannot be created, deleted or change type")
-
 type PaymentMethodProcessorImpl struct {
 	paymentMethodRepo repository.PaymentMethodRepository
-	outletSettings    outletSettingsReader
 }
 
-func NewPaymentMethodProcessorImpl(paymentMethodRepo repository.PaymentMethodRepository, outletSettings outletSettingsReader) *PaymentMethodProcessorImpl {
+func NewPaymentMethodProcessorImpl(paymentMethodRepo repository.PaymentMethodRepository) *PaymentMethodProcessorImpl {
 	return &PaymentMethodProcessorImpl{
 		paymentMethodRepo: paymentMethodRepo,
-		outletSettings:    outletSettings,
 	}
 }
 
 func (p *PaymentMethodProcessorImpl) CreatePaymentMethod(ctx context.Context, req *models.CreatePaymentMethodRequest) (*models.PaymentMethodResponse, error) {
-	if req.Type == constants.PaymentMethodTypePoint {
-		return nil, ErrSystemPaymentMethod
-	}
 	exists, err := p.paymentMethodRepo.ExistsByName(ctx, req.OrganizationID, req.Name, nil)
 	if err != nil {
 		return nil, fmt.Errorf("failed to check payment method name uniqueness: %w", err)
@@ -89,17 +77,6 @@ func (p *PaymentMethodProcessorImpl) ListPaymentMethods(ctx context.Context, req
 	if req.Search != "" {
 		filters["search"] = req.Search
 	}
-	// At the cashier EnakPoint only shows where the outlet accepts it (F9). Filtered in
-	// the query so paging stays right.
-	if req.OutletID != nil && p.outletSettings != nil {
-		settings, err := p.outletSettings.Outlet(ctx, *req.OutletID)
-		if err != nil {
-			return nil, fmt.Errorf("failed to read outlet loyalty settings: %w", err)
-		}
-		if !settings.PointPayment.AcceptPayment {
-			filters["exclude_type"] = string(constants.PaymentMethodTypePoint)
-		}
-	}
 
 	offset := (req.Page - 1) * req.Limit
 
@@ -139,15 +116,6 @@ func (p *PaymentMethodProcessorImpl) UpdatePaymentMethod(ctx context.Context, id
 		return nil, fmt.Errorf("payment method not found: %w", err)
 	}
 
-	// The EnakPoint method keeps its type, and no other method can become one.
-	if req.Type != nil {
-		wasPoint := existingPaymentMethod.Type == entities.PaymentMethodTypePoint
-		isPoint := *req.Type == constants.PaymentMethodTypePoint
-		if wasPoint != isPoint {
-			return nil, ErrSystemPaymentMethod
-		}
-	}
-
 	// Check name uniqueness if name is being updated
 	if req.Name != nil && *req.Name != existingPaymentMethod.Name {
 		exists, err := p.paymentMethodRepo.ExistsByName(ctx, existingPaymentMethod.OrganizationID, *req.Name, &id)
@@ -179,13 +147,10 @@ func (p *PaymentMethodProcessorImpl) UpdatePaymentMethod(ctx context.Context, id
 
 func (p *PaymentMethodProcessorImpl) DeletePaymentMethod(ctx context.Context, id uuid.UUID) error {
 	// Check if payment method exists
-	existing, err := p.paymentMethodRepo.GetByID(ctx, id)
+	_, err := p.paymentMethodRepo.GetByID(ctx, id)
 	if err != nil {
 		return fmt.Errorf("payment method not found: %w", err)
 	}
-	if existing.Type == entities.PaymentMethodTypePoint {
-		return ErrSystemPaymentMethod
-	}
 
 	// TODO: Check if payment method is being used in any payments
 	// For now, allow deletion