feat(mtproto): add MTProto (FakeTLS) protocol via managed mtg sidecar (#5076)

* feat(mtproto): add MTProto (FakeTLS) protocol via managed mtg sidecar

Xray-core has no mtproto proxy, so mtproto inbounds run as standalone
mtg (9seconds/mtg) sidecar processes managed by the panel — one per
inbound — and are excluded from the generated Xray config entirely.

- model: MTProto protocol constant, validator, and FakeTLS secret
  helpers (GenerateFakeTLSSecret/HealMtprotoSecret)
- mtproto package: per-inbound mtg process manager with reconcile,
  graceful stop, and best-effort Prometheus traffic scraping
- runtime: delegate mtproto inbounds to the mtg manager instead of the
  Xray gRPC API; skip mtproto when building the Xray config
- web: boot reconcile + StopAll wiring, periodic reconcile/traffic job,
  port-conflict transport, secret healing on inbound add/update
- sub: tg:// proxy share-link generation
- frontend: protocol option, Zod schema, Protocol tab (FakeTLS domain +
  regenerable secret), info-modal link, and i18n
- provisioning: fetch mtg v2.2.8 in install.sh, DockerInit.sh, and the
  Linux + Windows release workflows

* fix

* fix

* fix: address Copilot review comments on mtproto PR

- web/web.go: create NewMtprotoJob once and reuse for cron + initial run
- mtproto/manager.go: StopAll cleans up per-inbound config files on shutdown
- mtproto/manager.go: CollectTraffic releases mutex before HTTP scrapes to
  avoid blocking Ensure/Reconcile/Remove during network I/O
- database/model/model.go: panic on crypto/rand failure in mtprotoRandomMiddle
  instead of silently producing a weak all-zero secret
- install.sh: fix chmod to handle renamed bin/mtg-linux-arm on armv5/v6/v7

web/service/inbound.go

@@ -621,6 +621,17 @@ func (s *InboundService) normalizeStreamSettings(inbound *model.Inbound) {
 	}
 }
 
+// normalizeMtprotoSecret rebuilds an mtproto inbound's FakeTLS secret so it is
+// always valid and matches the configured domain before the row is persisted.
+func (s *InboundService) normalizeMtprotoSecret(inbound *model.Inbound) {
+	if inbound.Protocol != model.MTProto {
+		return
+	}
+	if healed, ok := model.HealMtprotoSecret(inbound.Settings); ok {
+		inbound.Settings = healed
+	}
+}
+
 // AddInbound creates a new inbound configuration.
 // It validates port uniqueness, client email uniqueness, and required fields,
 // then saves the inbound to the database and optionally adds it to the running Xray instance.
@@ -628,6 +639,7 @@ func (s *InboundService) normalizeStreamSettings(inbound *model.Inbound) {
 func (s *InboundService) AddInbound(inbound *model.Inbound) (*model.Inbound, bool, error) {
 	// Normalize streamSettings based on protocol
 	s.normalizeStreamSettings(inbound)
+	s.normalizeMtprotoSecret(inbound)
 
 	conflict, err := s.checkPortConflict(inbound, 0)
 	if err != nil {
@@ -943,6 +955,7 @@ func (s *InboundService) SetInboundEnable(id int, enable bool) (bool, error) {
 func (s *InboundService) UpdateInbound(inbound *model.Inbound) (*model.Inbound, bool, error) {
 	// Normalize streamSettings based on protocol
 	s.normalizeStreamSettings(inbound)
+	s.normalizeMtprotoSecret(inbound)
 
 	conflict, err := s.checkPortConflict(inbound, inbound.Id)
 	if err != nil {