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/fr.js

@@ -587,4 +587,18 @@ export default {
   "bm.addTest": "Ajouter un test",
   "bm.emptyAnswer": "réponse vide",
   "bm.loopDetected": "boucle détectée",
+
+  // benchmark: routing mode, cost, live
+  "bm.mode.routing": "Routage intelligent",
+  "bm.mode.models": "Modèles individuels",
+  "bm.mode.routingDesc": "La fonctionnalité clé du produit à l'épreuve : chaque sonde passe par cortiq-auto — vous voyez quelle tâche le routeur a détectée, quel modèle il a choisi, si cela correspond aux attentes et combien cela a coûté.",
+  "bm.mode.modelsDesc": "La même suite épinglée aux modèles choisis — comparez leur qualité, vitesse et coût en direct, sans passer par le routeur.",
+  "bm.answersOk": "réponses correctes",
+  "bm.classAcc": "classification des tâches",
+  "bm.modelDist": "Requêtes envoyées vers",
+  "bm.expectedLbl": "attendu :",
+  "bm.answer": "Réponse",
+  "bm.liveRunning": "en cours…",
+  "bm.spent": "dépensé",
+  "bm.verdict": "🏁 Terminé : réponses {p}, dépensé {s}",
 };