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/lib/xray/inbound-link.ts

@@ -680,6 +680,28 @@ export function genHysteriaLink(input: GenHysteriaLinkInput): string {
   return url.toString();
 }
 
+export interface GenMtprotoLinkInput {
+  inbound: Inbound;
+  address: string;
+  port?: number;
+  remark?: string;
+}
+
+// Builds a Telegram proxy deep link for an mtproto inbound:
+// tg://proxy?server=<addr>&port=<port>&secret=<ee FakeTLS secret>.
+export function genMtprotoLink(input: GenMtprotoLinkInput): string {
+  const { inbound, address, port = inbound.port, remark = '' } = input;
+  if (inbound.protocol !== 'mtproto') return '';
+  const secret = inbound.settings.secret ?? '';
+  if (secret.length === 0) return '';
+  const url = new URL('tg://proxy');
+  url.searchParams.set('server', address);
+  url.searchParams.set('port', String(port));
+  url.searchParams.set('secret', secret);
+  url.hash = encodeURIComponent(remark);
+  return url.toString();
+}
+
 export interface GenWireguardLinkInput {
   settings: WireguardInboundSettings;
   address: string;
@@ -867,6 +889,8 @@ export function genLink(input: GenLinkInput): string {
         clientAuth: client.auth ?? '',
         externalProxy,
       });
+    case 'mtproto':
+      return genMtprotoLink({ inbound, address, port, remark });
     default:
       return '';
   }