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EnakPoint & EnakCoin PRD and tasks note what is superseded.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

@@ -21,7 +21,7 @@ type EarningLine struct {
 
 // EarningResult is what an order earns.
 type EarningResult struct {
-	// subtotal − discount − the part paid with EnakPoint, in rupiah, never negative.
+	// subtotal − discount, in rupiah, never negative.
 	// Tax and anything else added on top of the subtotal are not part of it (Q1).
 	Basis float64
 	Point EarningLine
@@ -49,17 +49,16 @@ func (r EarningResult) Metadata(line EarningLine) entities.Metadata {
 
 // CalculateEarning applies the earning formula of docs/prd-point-coin.md F1:
 //
-//	basis  = subtotal − discount_amount − paid with EnakPoint
+//	basis  = subtotal − discount_amount
 //	amount = 0                                  if basis < min_order_amount
 //	amount = floor(basis / earn_per_amount) × earn_value    in PER_AMOUNT mode
 //	amount = floor(basis × earn_percent / 100)              in PERCENTAGE mode
 //	amount = min(amount, max_per_order)         if max_per_order is set
 //
-// The part paid with EnakPoint earns nothing (Q10). Money is handled in whole cents so
-// floor never lands one short on a value like 87500.00 that float64 cannot hold
-// exactly. It has no side effects.
-func CalculateEarning(order *entities.Order, pointPaidAmount float64, settings models.OutletLoyaltySettings) EarningResult {
-	basisCents := toCents(order.Subtotal) - toCents(order.DiscountAmount) - toCents(pointPaidAmount)
+// Money is handled in whole cents so floor never lands one short on a value like
+// 87500.00 that float64 cannot hold exactly. It has no side effects.
+func CalculateEarning(order *entities.Order, settings models.OutletLoyaltySettings) EarningResult {
+	basisCents := toCents(order.Subtotal) - toCents(order.DiscountAmount)
 	if basisCents < 0 {
 		basisCents = 0
 	}