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.

internal/sub/json_service.go

@@ -309,6 +309,9 @@ func (s *SubJsonService) tlsData(tData map[string]any) map[string]any {
 	if ech, ok := tlsClientSettings["echConfigList"].(string); ok && ech != "" {
 		tlsData["echConfigList"] = ech
 	}
+	if vcn, ok := verifyPeerCertByNameValue(tlsClientSettings); ok {
+		tlsData["verifyPeerCertByName"] = vcn
+	}
 	// xray-core now parses pinnedPeerCertSha256 as a comma-separated string, not
 	// an array; emit the joined form so v2ray clients can import the config (#5401).
 	if pins, ok := pinnedSha256List(tlsClientSettings); ok {