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_test.go

@@ -35,7 +35,15 @@ func (stubResolver) Resolve(sku, currency string) (int64, string, string, error)
 
 type spyEnqueuer struct {
 	calls    []map[string]any
-	failNext bool // 置 true 模拟 outbox 入队失败(settle 崩溃窗口测试用)
+	failNext bool // 置 true 模拟 outbox 入队失败(settle 崩溃窗口测试用),命中后消费一次即清零。
+	// failOnEventType 非空时,下一次遇到该 event_type 的入队调用失败一次(消费后清空)——用于
+	// 测试"同一 HandleCallback 内先后两次 Enqueue,只让第二次(如 subscription.created)失败,
+	// 第一次(如 payment.succeeded)先成功"这类场景,failNext 做不到按 event_type 区分。
+	failOnEventType string
+	seen            map[string]bool // 镜像真实 WebhookStore.EnqueueDelivery 的 (out_trade_no,event_type,
+	// refund_id) 唯一键 ON CONFLICT DO NOTHING:重复 key 静默 no-op(不追加 calls,也不算失败)。
+	// 修复"重投补入队自愈"后,业务代码会在 duplicate/重投分支也调用 Enqueue,若 spy 仍是无脑
+	// 计数器就会把 outbox 天然幂等的重复行误判成"多发了一次 webhook",这里镜像真实幂等语义。
 }
 
 func (s *spyEnqueuer) Enqueue(outTradeNo, bizSystem, eventType, refundID string, data map[string]any) error {
@@ -43,6 +51,18 @@ func (s *spyEnqueuer) Enqueue(outTradeNo, bizSystem, eventType, refundID string,
 		s.failNext = false
 		return errors.New("outbox down")
 	}
+	if s.failOnEventType != "" && eventType == s.failOnEventType {
+		s.failOnEventType = ""
+		return errors.New("outbox down")
+	}
+	key := outTradeNo + "|" + eventType + "|" + refundID
+	if s.seen == nil {
+		s.seen = make(map[string]bool)
+	}
+	if s.seen[key] {
+		return nil // 幂等 no-op,行已存在
+	}
+	s.seen[key] = true
 	s.calls = append(s.calls, data)
 	return nil
 }
@@ -52,6 +72,8 @@ func newGateway(t *testing.T) (*gateway.Gateway, *fake.Provider, *spyEnqueuer, *
 	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)
@@ -62,7 +84,7 @@ func newGateway(t *testing.T) (*gateway.Gateway, *fake.Provider, *spyEnqueuer, *
 	})
 	picker := accounts.NewRouter(areg, nil, nil) // 默认 round_robin
 	spy := &spyEnqueuer{}
-	g := gateway.New(orders, refunds, preg, picker, stubResolver{}, spy, "global")
+	g := gateway.New(orders, refunds, preg, picker, stubResolver{}, spy, "global", subs, chargebacks)
 	return g, fp, spy, orders
 }