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/lib/xray/outbound-link-parser.ts

@@ -213,6 +213,7 @@ function applySecurityParams(stream: Raw, params: URLSearchParams): void {
     const alpn = params.get('alpn');
     if (alpn) tls.alpn = alpn.split(',');
     tls.echConfigList = params.get('ech') ?? '';
+    tls.verifyPeerCertByName = params.get('vcn') ?? '';
     tls.pinnedPeerCertSha256 = params.get('pcs') ?? '';
   } else if (stream.security === 'reality') {
     const reality = stream.realitySettings as Raw;
@@ -434,7 +435,7 @@ export function parseHysteria2Link(link: string): Raw | null {
       alpn: alpn ? alpn.split(',') : ['h3'],
       fingerprint: params.get('fp') ?? '',
       echConfigList: params.get('ech') ?? '',
-      verifyPeerCertByName: '',
+      verifyPeerCertByName: params.get('vcn') ?? '',
       pinnedPeerCertSha256: params.get('pinSHA256') ?? '',
     },
   };