refactor(entrypoint): move route registry into entrypoint context

Replace global routes registry with entrypoint-scoped pools and
context lookups, and centralize API/metrics startup in config state.

internal/types/routes.go

@@ -20,6 +20,7 @@ type (
 		pool.Object
 		ProviderName() string
 		GetProvider() RouteProvider
+		ListenURL() *nettypes.URL
 		TargetURL() *nettypes.URL
 		HealthMonitor() HealthMonitor
 		SetHealthMonitor(m HealthMonitor)