feat(routing): per-task rules on top of complexity tiers; hosted router is the default

The router has always returned two signals — task label and complexity tier —
but only the tier picked models. [routing.tasks] adds `label → ordered models`:
a matching rule's models lead the candidate chain and the tier chain follows as
fallback, so pinning translations to a local model never weakens failover.
Requests whose chain was headed by a task rule report
route_source "router+task-rule".

The Routing page grows a per-task editor built from the account's LIVE
taxonomy (GET /v1/taxonomies via the new /admin/api/routing/labels proxy;
built-in label set when the router is unreachable), with localized task names,
each task's share of 7-day traffic, "by complexity (no rule)" as the explicit
empty state, and custom labels for other taxonomies. Deleting a model scrubs
it from task rules like it always did from tiers.

Also fixes the default config pointing at a placeholder localhost:8080 router
with a nonexistent taxonomy — a fresh install now targets the hosted allaigate
router (IP endpoint, verify_tls off, data-assistant, 12 s oracle timeout) and
degrades gracefully until a key is set. Verified end-to-end against the live
router: translation → task-rule model, math → tier path.

16 new strings in all 7 languages.

web/js/i18n/tr.js

@@ -545,4 +545,22 @@ export default {
   "bench.running": "ölçülüyor…",
   "bench.failed": "başarısız",
   "bench.none": "Henüz yerel .cmf sohbet modeli yok.",
+
+  // task-based routing
+  "task.chitchat": "Sohbet",
+  "task.code": "Kod",
+  "task.creative-writing": "Yaratıcı yazarlık",
+  "task.extraction": "Veri çıkarma",
+  "task.math": "Matematik",
+  "task.qa": "Soru-cevap",
+  "task.summarization": "Özetleme",
+  "task.translation": "Çeviri",
+  "routing.tasks.title": "Göreve göre yönlendirme",
+  "routing.tasks.hint": "Kuralın modelleri kendi görevi için önce gelir; karmaşıklık zinciri yedek olarak kalır. Boş = yalnızca karmaşıklığa göre.",
+  "routing.tasks.inherit": "karmaşıklığa göre (kural yok)",
+  "routing.tasks.share": "isteklerin %{p}'i (7 g)",
+  "routing.tasks.fromRouter": "etiketler yönlendiriciden canlı",
+  "routing.tasks.builtin": "yönlendiriciye ulaşılamıyor — yerleşik etiket seti",
+  "routing.tasks.addCustom": "Görev ekle",
+  "routing.tasks.addPlaceholder": "özel etiket…",
 };