fix(traffic): count local traffic for clients whose shared row is node-owned (#4921)

client_traffics is keyed by email (one shared row per client across every
inbound it is attached to). addClientTraffic filtered with
`inbound_id NOT IN (node inbounds)`, so when a client was attached to both a
node inbound and the mother inbound and the node inbound was attached first,
the shared row carried the node inbound's id (AddClientStat uses OnConflict
DoNothing and never refreshes it) and the local xray's traffic for that client
was dropped entirely. The client showed online but its usage stayed at zero
unless the mother inbound happened to be attached first.

Match purely by email instead. The reported emails come only from the local
xray, which only knows local-attached clients, so the query is still correctly
scoped, and this also repairs already-broken rows that a per-row AddClientStat
fix alone could not.

web/service/inbound.go

@@ -1879,9 +1879,16 @@ func (s *InboundService) addClientTraffic(tx *gorm.DB, traffics []*xray.ClientTr
 		emails = append(emails, traffic.Email)
 	}
 	dbClientTraffics := make([]*xray.ClientTraffic, 0, len(traffics))
+	// Match purely by email. client_traffics is email-keyed (one shared row per
+	// email regardless of how many inbounds the client is attached to), and these
+	// emails come from the local xray's report, so they always belong to a client
+	// attached to a local inbound. The old `inbound_id NOT IN (node inbounds)`
+	// filter dropped the local traffic of a client attached to both a node and the
+	// mother inbound whenever the node inbound happened to be attached first — its
+	// shared row then carried the node inbound's id (AddClientStat uses OnConflict
+	// DoNothing and never refreshes it), so the local poll skipped it entirely.
 	err = tx.Model(xray.ClientTraffic{}).
-		Where("email IN (?) AND inbound_id NOT IN (?)", emails,
-			tx.Model(&model.Inbound{}).Select("id").Where("node_id IS NOT NULL")).
+		Where("email IN (?)", emails).
 		Find(&dbClientTraffics).Error
 	if err != nil {
 		return err