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/handler/refund_test.go

@@ -45,11 +45,13 @@ func buildRefundEngine(t *testing.T) (*gin.Engine, *gateway.Gateway, *store.Orde
 	db := model.OpenTestDB(t)
 	orders := store.NewOrderStore(db)
 	refunds := store.NewRefundStore(db)
+	subs := store.NewSubscriptionStore(db)
+	chargebacks := store.NewChargebackStore(db)
 	preg := provider.NewRegistry()
 	fp := fake.New()
 	preg.Register(fp)
 	areg := accounts.New([]config.AccountConfig{{AccountID: "fake-a1", Channel: "fake", Region: "global", Enabled: true, Weight: 1}})
-	g := gateway.New(orders, refunds, preg, accounts.NewRouter(areg, nil, nil), oneResolver{}, nopEnqueuer{}, "global")
+	g := gateway.New(orders, refunds, preg, accounts.NewRouter(areg, nil, nil), oneResolver{}, nopEnqueuer{}, "global", subs, chargebacks)
 	r := gin.New()
 	router.SetupV2(r, g)
 	return r, g, orders, fp