feat(benchmark): smart-routing mode is the point — live results, per-model cost

The benchmark now leads with the product's actual feature. Two explicit modes:

  🧭 Smart routing (default) — every probe goes through cortiq-auto; each row
     shows the router's task label judged against the expected one (✓/✗ with
     "expected: …"), the complexity tier, the chosen model with what that
     request cost, and a task-rule badge when a routing rule fired. KPIs:
     answer quality, classification accuracy, TTFT, tok/s and money spent,
     plus a "requests went to" distribution with per-model cost.
  🎯 Individual models — the old head-to-head comparison, now as the clearly
     separate option (model checkboxes appear only here).

The suite covers all 8 taxonomy labels (added summarization, creative-writing
and chitchat probes; expected labels annotated per test). Results are LIVE:
the table grows a row after every test (with a small fade-in), the progress
card shows the prompt being asked, and a 🏁 verdict toast lands at the end
with the score and the total spend.

12 new strings in all 7 languages.

web/js/i18n/es.js

@@ -587,4 +587,18 @@ export default {
   "bm.addTest": "Añadir prueba",
   "bm.emptyAnswer": "respuesta vacía",
   "bm.loopDetected": "bucle detectado",
+
+  // benchmark: routing mode, cost, live
+  "bm.mode.routing": "Enrutado inteligente",
+  "bm.mode.models": "Modelos individuales",
+  "bm.mode.routingDesc": "La función clave del producto a prueba: cada sonda pasa por cortiq-auto — ves qué tarea detectó el router, qué modelo eligió, si coincide con lo esperado y cuánto costó.",
+  "bm.mode.modelsDesc": "La misma suite fijada a los modelos elegidos — compara su calidad, velocidad y coste directamente, sin pasar por el router.",
+  "bm.answersOk": "respuestas correctas",
+  "bm.classAcc": "clasificación de tareas",
+  "bm.modelDist": "Las peticiones fueron a",
+  "bm.expectedLbl": "esperado:",
+  "bm.answer": "Respuesta",
+  "bm.liveRunning": "en curso…",
+  "bm.spent": "gastado",
+  "bm.verdict": "🏁 Listo: respuestas {p}, gastado {s}",
 };