feat(tls,reality): port xray TLS/REALITY fields, cert-hash helpers, fallback UX

TLS: add verifyPeerCertByName (vcn) to inbound settings + emit in both share-link generators (frontend + Go sub) and outbound parser; the allowInsecure replacement xray removed after 2026-06-01. Add server-side curvePreferences, masterKeyLog, echSockopt (passthrough + form) at tlsSettings top-level so they survive the panel-only settings strip.

REALITY: add limitFallbackUpload/Download (afterBytes/bytesPerSec/burstBytesPerSec) with per-field tooltips, plus masterKeyLog. Verified field names/semantics against pinned xray v1.260327.1 (bytesPerSec=0 disables).

Hosts: fix verify_peer_cert_by_name column bool->string (xray expects comma-separated names) with an idempotent, history-gate-free migration (SQLite typeof blank; Postgres ALTER once); emit vcn for hosts/external proxies.

Server: add getCertHash (local cert DER SHA-256) and getRemoteCertHash (xray tls ping) endpoints + api-docs; wire pinned-cert field buttons. Drop the meaningless random-hash button.

Xray UI: metrics endpoint (listen/tag) config in Basics; import/export for routing rules and outbounds.

Fallbacks card: compact empty state, header-aligned actions, responsive labeled grid rows.

i18n: add all new keys to every locale; drop unused generateRandomPin.

frontend/src/schemas/protocols/security/tls.ts

@@ -1,5 +1,7 @@
 import { z } from 'zod';
 
+import { SockoptStreamSettingsSchema } from '@/schemas/protocols/stream/sockopt';
+
 export const TlsVersionSchema = z.enum(['1.0', '1.1', '1.2', '1.3']);
 export type TlsVersion = z.infer<typeof TlsVersionSchema>;
 
@@ -57,6 +59,11 @@ export const TlsClientSettingsSchema = z.object({
   fingerprint: TlsFingerprintSchema.default('chrome'),
   echConfigList: z.string().default(''),
   pinnedPeerCertSha256: z.array(z.string()).default([]),
+  // Panel-only client directive (v2rayN `vcn`): verify the server certificate
+  // against this name instead of the SNI. Comma-separated names. Shipped in
+  // share links / subscriptions; the modern replacement for `allowInsecure`,
+  // which xray-core removed after 2026-06-01.
+  verifyPeerCertByName: z.string().default(''),
 });
 export type TlsClientSettings = z.infer<typeof TlsClientSettingsSchema>;
 
@@ -73,6 +80,12 @@ export const TlsStreamSettingsSchema = z.object({
   certificates: z.array(TlsCertSchema).default([]),
   alpn: z.array(AlpnSchema).default(['h2', 'http/1.1']),
   echServerKeys: z.string().default(''),
-  settings: TlsClientSettingsSchema.default({ fingerprint: 'chrome', echConfigList: '', pinnedPeerCertSha256: [] }),
+  // Server-side TLS fields (xray-core TLSConfig top-level): survive the
+  // panel-only `settings` strip and reach the runtime config. Optional so
+  // existing inbounds round-trip unchanged.
+  curvePreferences: z.array(z.string()).optional(),
+  masterKeyLog: z.string().optional(),
+  echSockopt: SockoptStreamSettingsSchema.optional(),
+  settings: TlsClientSettingsSchema.default({ fingerprint: 'chrome', echConfigList: '', pinnedPeerCertSha256: [], verifyPeerCertByName: '' }),
 });
 export type TlsStreamSettings = z.infer<typeof TlsStreamSettingsSchema>;