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/schemas/protocols/inbound/index.ts

@@ -3,6 +3,7 @@ import { z } from 'zod';
 import { HttpInboundSettingsSchema } from './http';
 import { HysteriaInboundSettingsSchema } from './hysteria';
 import { MixedInboundSettingsSchema } from './mixed';
+import { MtprotoInboundSettingsSchema } from './mtproto';
 import { ShadowsocksInboundSettingsSchema } from './shadowsocks';
 import { TrojanInboundSettingsSchema } from './trojan';
 import { TunInboundSettingsSchema } from './tun';
@@ -14,6 +15,7 @@ import { WireguardInboundSettingsSchema } from './wireguard';
 export * from './http';
 export * from './hysteria';
 export * from './mixed';
+export * from './mtproto';
 export * from './shadowsocks';
 export * from './trojan';
 export * from './tun';
@@ -38,5 +40,6 @@ export const InboundSettingsSchema = z.discriminatedUnion('protocol', [
   z.object({ protocol: z.literal('mixed'),       settings: MixedInboundSettingsSchema }),
   z.object({ protocol: z.literal('tunnel'),      settings: TunnelInboundSettingsSchema }),
   z.object({ protocol: z.literal('tun'),         settings: TunInboundSettingsSchema }),
+  z.object({ protocol: z.literal('mtproto'),     settings: MtprotoInboundSettingsSchema }),
 ]);
 export type InboundSettings = z.infer<typeof InboundSettingsSchema>;

frontend/src/schemas/protocols/inbound/mtproto.ts

@@ -0,0 +1,10 @@
+import { z } from 'zod';
+
+// MTProto (Telegram) inbound. Served by an mtg sidecar process, not Xray, so
+// it has no clients and no stream settings. `secret` is the FakeTLS secret
+// (ee-prefixed); the backend rebuilds it to match `fakeTlsDomain` on save.
+export const MtprotoInboundSettingsSchema = z.object({
+  fakeTlsDomain: z.string().default('www.cloudflare.com'),
+  secret: z.string().default(''),
+});
+export type MtprotoInboundSettings = z.infer<typeof MtprotoInboundSettingsSchema>;