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

frontend/src/pages/inbounds/form/InboundFormModal.tsx

@@ -54,6 +54,7 @@ import {
   HttpFields,
   HysteriaFields,
   MixedFields,
+  MtprotoFields,
   ShadowsocksFields,
   TunFields,
   TunnelFields,
@@ -578,6 +579,8 @@ export default function InboundFormModal({
       {protocol === Protocols.HTTP && <HttpFields />}
       {protocol === Protocols.MIXED && <MixedFields mixedUdpOn={mixedUdpOn} />}
 
+      {protocol === Protocols.MTPROTO && <MtprotoFields />}
+
       {protocol === Protocols.SHADOWSOCKS && <ShadowsocksFields form={form} isSSWith2022={isSSWith2022} />}
 
       {protocol === Protocols.VLESS && <VlessFields saving={saving} selectedVlessAuth={selectedVlessAuth} network={network} security={security} getNewVlessEnc={getNewVlessEnc} clearVlessEnc={clearVlessEnc} />}
@@ -883,6 +886,7 @@ export default function InboundFormModal({
               Protocols.TUNNEL,
               Protocols.TUN,
               Protocols.WIREGUARD,
+              Protocols.MTPROTO,
             ] as string[]).includes(protocol) || isFallbackHost
               ? [{ key: 'protocol', label: t('pages.inbounds.protocol'), children: protocolTab, forceRender: true }]
               : []),