chore(router): address the hosted router by hostname, TLS verification on

router.allaigate.com now resolves and serves a valid certificate, so the
hosted routing API no longer has to be reached by bare IP with certificate
verification switched off. Make https://router.allaigate.com the default
[router].url with verify_tls = true.

Existing configs still pointing at 138.226.222.209 (with or without a scheme
or a trailing slash) are moved to the hostname on load and have verification
restored, then saved: it is the same machine, and this is the difference
between a verified connection and a blind one. A self-hosted router URL is
left untouched.

README, docs/ROUTER.md (both languages), config/gateway.example.toml and
bench/accuracy.py follow.

Verified live: the migration rewrites a legacy config on startup, admin
health reports the hostname reachable over verified TLS (389 ms), and real
requests route through it - "math"/medium 0.416 and "translation"/low 0.268
with route_source=router.

docs/ROUTER.md

@@ -41,11 +41,11 @@ minted and shown to you.
 
 ```toml
 [router]
-url         = "https://138.226.222.209"   # allaigate routing API
-verify_tls  = false                        # cert is bound to an IP
+url         = "https://router.allaigate.com"  # allaigate routing API (the default)
+verify_tls  = true                            # valid certificate — keep verification on
 taxonomy_id = "data-assistant"
-api_key_env = "CORTIQ_ROUTER_KEY"          # your cortiq_… key
-timeout_ms  = 15000                        # allow for oracle escalation on hard prompts
+api_key_env = "CORTIQ_ROUTER_KEY"             # your cortiq_… key
+timeout_ms  = 15000                           # allow for oracle escalation on hard prompts
 ```
 
 ```bash

docs/ROUTER.ru.md

@@ -40,11 +40,11 @@ Cortiq Gateway — тонкий и быстрый прокси; **интелле
 
 ```toml
 [router]
-url         = "https://138.226.222.209"   # routing API allaigate
-verify_tls  = false                        # серт привязан к IP
+url         = "https://router.allaigate.com"  # routing API allaigate (значение по умолчанию)
+verify_tls  = true                            # валидный сертификат — проверку не выключаем
 taxonomy_id = "data-assistant"
-api_key_env = "CORTIQ_ROUTER_KEY"          # ваш ключ cortiq_…
-timeout_ms  = 15000                        # запас под oracle-эскалацию на сложных запросах
+api_key_env = "CORTIQ_ROUTER_KEY"             # ваш ключ cortiq_…
+timeout_ms  = 15000                           # запас под oracle-эскалацию на сложных запросах
 ```
 
 ```bash