V2.0.1: listen override fix, sing-box core fetch, probe settings page + fast report, spx removal, core mem env

- 0: sing-box gen overrides fragment listen/port from the inbound row
  (empty listen -> "::"), Update/Add recompute the stored fragment;
  non-loopback E2E against the real core binary.
- 1: agent fetches the sing-box core from the Gitea release when
  missing, self-checks it, and only then latches the switch.
- 2: node list shows the sing-box core version (heartbeat field,
  persisted on the node row), xray version as fallback.
- 3: public-page fallback returns 404 to anonymous visitors when the
  page is disabled.
- 4: settings restart hint bar removed, dead i18n keys cleaned.
- 5: two PUT calls missing JSON headers fixed (audit: only those two),
  batch probe-task creation endpoint + UI.
- 6: cf-probe retirement card and coverage pipeline removed.
- 7: generated vless links no longer carry spx (panel export + sub);
  parser still accepts spx; golden fixtures updated.
- probe batch: dedicated probe settings tab (public-page settings,
  tasks, per-node meta), retention_days editable, per-node traffic
  calibration + stat-interface pinning, runtime metrics split into a
  lightweight fast report (default 3s, 1-60s adjustable).
- 8: sing-box core processes start with GOMEMLIMIT=32MiB, GOGC=50.
- 9: dead /getTwoFactorEnable docs entries removed (frontend call and
  contract entry already gone at base; verified by grep).

internal/web/translation/es-ES.json

@@ -856,7 +856,7 @@
       "uptime": "Tiempo activo",
       "latency": "Latencia",
       "lastHeartbeat": "Último latido",
-      "xrayVersion": "Versión de Xray",
+      "coreVersion": "Core version",
       "panelVersion": "Versión del panel",
       "actions": "Acciones",
       "probe": "Sondear ahora",
@@ -971,6 +971,12 @@
         "countryPin": "Country pin (e.g. JP)",
         "ipv4Pin": "IPv4 pin",
         "ipv6Pin": "IPv6 pin",
+        "calUp": "Uplink correction (GB)",
+        "calDown": "Downlink correction (GB)",
+        "calHint": "Corrections are added to the counted traffic (negative values subtract) and apply to panel statistics, the public page and traffic alerts.",
+        "statIface": "Counted interface",
+        "movedHint": "Probe metadata (pricing, traffic limits, calibration…) is edited on the probe settings page.",
+        "goSettings": "Open probe settings",
         "save": "Save status page info",
         "saved": "Status page info saved",
         "saveFailed": "Saving status page info failed"
@@ -1000,7 +1006,13 @@
         "saved": "Probe task saved",
         "deleted": "Probe task deleted",
         "loadFailed": "Failed to load probe tasks",
-        "saveFailed": "Operation failed"
+        "saveFailed": "Operation failed",
+        "batchTitle": "Batch add",
+        "batchPlaceholder": "One target per line, or comma-separated — host:port, e.g. 1.1.1.1:443",
+        "batchSubmit": "Add all",
+        "batchHint": "The shared fields apply to every target; leave the name empty to name each task after its target.",
+        "batchEmpty": "Enter at least one target",
+        "batchDone": "Added {{count}} probe tasks"
       }
     },
     "settings": {
@@ -1034,6 +1046,15 @@
         "alreadyLatest": "Already the latest version",
         "config": "Theme settings"
       },
+      "probe": {
+        "title": "Probe settings",
+        "retentionDays": "History retention (days)",
+        "retentionHint": "How long probe history (metrics and latency) is kept.",
+        "fastInterval": "Fast report interval",
+        "fastIntervalHint": "How often agents report runtime metrics; everything else still rides the 60 s heartbeat.",
+        "metaTitle": "Per-node probe metadata",
+        "metaNodePlaceholder": "Select a node"
+      },
       "probeNotify": {
         "notifyTitle": "Notifications",
         "notifyHint": "Offline, traffic and expiry alerts, delivered to the channels below (Telegram reuses the panel bot settings).",
@@ -1057,23 +1078,11 @@
         "clearSecret": "Clear",
         "templateHint": "Placeholders: {{title}} {{message}} {{node}} {{event}} {{time}} {{count}} {{site}}",
         "testSend": "Send a test alert",
-        "testSent": "Test alert sent: {{channels}}",
-        "retireTitle": "cf-probe retirement checklist",
-        "retireHint": "Only once every node is served by the panel may the old public page be switched off, in the order given in the deployment notes.",
-        "retirePublicPage": "Public page",
-        "retirePublicPageOff": "Off (enable it above)",
-        "retireHasProbe": "Probe reporting",
-        "retireNoProbe": "No probe data",
-        "retireOnline": "Online",
-        "retireOffline": "Offline",
-        "retireProbeAt": "Last report {{time}}",
-        "retireAllReady": "Every node is served by the panel; cf-probe can be retired in the documented order.",
-        "retireNotReady": "Some nodes have no probe data yet; do not take cf-probe down."
+        "testSent": "Test alert sent: {{channels}}"
       },
       "defaultTag": "Predeterminado",
       "title": "Configuraciones",
       "save": "Guardar",
-      "infoDesc": "Cada cambio realizado aquí debe ser guardado. Por favor, reinicie el panel para aplicar los cambios.",
       "restartPanel": "Reiniciar panel",
       "restartPanelDesc": "¿Está seguro de que desea reiniciar el panel? Haga clic en Aceptar para reiniciar después de 3 segundos. Si no puede acceder al panel después de reiniciar, por favor, consulte la información de registro del panel en el servidor.",
       "restartPanelSuccess": "El panel se reinició correctamente",