Revert "feat(loyalty): EnakPoint & EnakCoin" (#32)

This reverts merge commit 645da30, returning main to f0ff59f.

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

internal/contract/analytics_contract.go

@@ -28,11 +28,7 @@ type PaymentMethodAnalyticsResponse struct {
 
 // PaymentMethodSummary represents the summary of payment method analytics
 type PaymentMethodSummary struct {
-	// Money actually received; EnakPoint is reported apart (docs/prd-point-coin.md F9).
 	TotalAmount       float64 `json:"total_amount"`
-	PointAmount       float64 `json:"point_amount"`
-	PointsUsed        int64   `json:"points_used"`
-	TotalWithPoints   float64 `json:"total_with_points"`
 	TotalOrders       int64   `json:"total_orders"`
 	TotalPayments     int64   `json:"total_payments"`
 	AverageOrderValue float64 `json:"average_order_value"`
@@ -46,8 +42,6 @@ type PaymentMethodAnalyticsData struct {
 	OrderCount        int64     `json:"order_count"`
 	PaymentCount      int64     `json:"payment_count"`
 	Percentage        float64   `json:"percentage"`
-	PointsUsed        int64     `json:"points_used"`
-	CountsAsCashIn    bool      `json:"counts_as_cash_in"`
 }
 
 type SalesAnalyticsRequest struct {