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/database/db.go

@@ -104,6 +104,14 @@ func migrateOutboundSubscriptionUserAgentColumn() error {
 	return migrator.AddColumn(&model.OutboundSubscription{}, "UserAgent")
 }
 
+func migrateInboundExcludeFromSubColumn() error {
+	migrator := db.Migrator()
+	if !migrator.HasTable(&model.Inbound{}) || migrator.HasColumn(&model.Inbound{}, "exclude_from_sub") {
+		return nil
+	}
+	return migrator.AddColumn(&model.Inbound{}, "ExcludeFromSub")
+}
+
 func initModels() error {
 	if err := migrateClientTrafficLastSubFetchColumn(); err != nil {
 		return err
@@ -111,6 +119,9 @@ func initModels() error {
 	if err := migrateOutboundSubscriptionUserAgentColumn(); err != nil {
 		return err
 	}
+	if err := migrateInboundExcludeFromSubColumn(); err != nil {
+		return err
+	}
 	models := allModels()
 	for _, mdl := range models {
 		if IsPostgres() && postgresModelSettled(mdl) {