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/model/testdb.go

@@ -32,7 +32,7 @@ func OpenTestDB(t *testing.T) *gorm.DB {
 		t.Fatalf("open test db: %v", err)
 	}
 	if err := db.AutoMigrate(&OrderV2{}, &Attempt{}, &Account{}, &Refund{}, &WebhookDelivery{},
-		&Product{}, &ProductPrice{}, &OrphanPayment{}); err != nil {
+		&Product{}, &ProductPrice{}, &OrphanPayment{}, &Subscription{}, &Chargeback{}); err != nil {
 		t.Fatalf("migrate: %v", err)
 	}
 	if err := UpgradeWebhookDeliveryIndex(db); err != nil {