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/en.js

@@ -580,4 +580,18 @@ export default {
   "bm.addTest": "Add test",
   "bm.emptyAnswer": "empty answer",
   "bm.loopDetected": "loop detected",
+
+  // benchmark: routing mode, cost, live
+  "bm.mode.routing": "Smart routing",
+  "bm.mode.models": "Individual models",
+  "bm.mode.routingDesc": "The product's core feature under test: every probe goes through cortiq-auto — you see which task the router detected, which model it picked, whether that matches expectations, and what it cost.",
+  "bm.mode.modelsDesc": "The same suite pinned to selected models — compare their quality, speed and cost head-to-head, bypassing the router.",
+  "bm.answersOk": "answers correct",
+  "bm.classAcc": "task classification",
+  "bm.modelDist": "Requests went to",
+  "bm.expectedLbl": "expected:",
+  "bm.answer": "Answer",
+  "bm.liveRunning": "running…",
+  "bm.spent": "spent",
+  "bm.verdict": "🏁 Done: answers {p}, spent {s}",
 };