merge: P8 订阅/recurring + 拒付 chargeback 并入(订阅生命周期/续费/取消/past_due/chargeback/事件集收口)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013nMthbVEmQquxBRKb9Fj8u

# Conflicts:
#	internal/model/testdb.go
#	internal/provider/provider.go
#	internal/router/router.go
#	internal/store/order_query_test.go
#	main.go

internal/gateway/gateway.go

@@ -39,19 +39,22 @@ type WebhookEnqueuer interface {
 }
 
 type Gateway struct {
-	orders    *store.OrderStore
-	refunds   *store.RefundStore
-	providers *provider.Registry
-	picker    accounts.Picker
-	products  ProductResolver
-	webhook   WebhookEnqueuer
-	region    string
+	orders      *store.OrderStore
+	refunds     *store.RefundStore
+	providers   *provider.Registry
+	picker      accounts.Picker
+	products    ProductResolver
+	webhook     WebhookEnqueuer
+	region      string
+	subs        *store.SubscriptionStore
+	chargebacks *store.ChargebackStore
 }
 
 func New(orders *store.OrderStore, refunds *store.RefundStore, providers *provider.Registry, picker accounts.Picker,
-	products ProductResolver, webhook WebhookEnqueuer, region string) *Gateway {
+	products ProductResolver, webhook WebhookEnqueuer, region string, subs *store.SubscriptionStore,
+	chargebacks *store.ChargebackStore) *Gateway {
 	return &Gateway{orders: orders, refunds: refunds, providers: providers, picker: picker,
-		products: products, webhook: webhook, region: region}
+		products: products, webhook: webhook, region: region, subs: subs, chargebacks: chargebacks}
 }
 
 type CreateOrderInput struct {