feat(inbound): excludeFromSub hides links without disabling (#6463)

* feat(inbound): excludeFromSub hides links without disabling

Add a per-inbound flag that omits subscription output while keeping the
inbound enabled for Xray, auth, and traffic accounting. Fixes #6435.

* fix(inbound): excludeFromSub review follow-ups

gofumpt model.go, sync docs OpenAPI, keep excludeFromSub master-authored
on node mirror, and exercise the legacy add-column migration path in tests.

* fix(sub): keep excluded inbounds' clients in the usage header

The excludeFromSub filter sat in getInboundsBySubId's SQL, so an excluded
inbound's clients never reached seenEmails in the raw, Clash or JSON
renderer. A client that lives only on a hidden inbound (one client per
inbound sharing a subId) dropped out of the Subscription-Userinfo usage,
quota and expiry and out of the info-node state, while the inbound kept
serving it and counting its traffic.

The query returns every enabled inbound again; each renderer skips an
excluded inbound's links but still counts its clients, the same rule the
Clash renderer already applies to external links it cannot express.

---------

Co-authored-by: mrchatam <mrchatam@users.noreply.github.com>
Co-authored-by: MHSanaei <ho3ein.sanaei@gmail.com>

internal/web/service/inbound.go

@@ -1864,6 +1864,7 @@ func (s *InboundService) UpdateInbound(inbound *model.Inbound) (*model.Inbound,
 		oldInbound.Total = inbound.Total
 		oldInbound.Remark = inbound.Remark
 		oldInbound.SubSortIndex = inbound.SubSortIndex
+		oldInbound.ExcludeFromSub = inbound.ExcludeFromSub
 		oldInbound.Enable = inbound.Enable
 		oldInbound.ExpiryTime = inbound.ExpiryTime
 		oldInbound.TrafficReset = inbound.TrafficReset