fix(infra): route tools Traefik to Next.js frontend (port 3000)

Frontend serves UI, proxies /api/* to Rust gateway on port 3001.
Rust gateway remains internal, not exposed via Traefik.

Co-Authored-By: Kilo <kilo@kilo.ai>

infra/traefik/dynamic/apps.yaml

@@ -54,7 +54,7 @@ http:
     tools-service:
       loadBalancer:
         servers:
-          - url: 'http://tools:3001'
+          - url: 'http://tools:3000'
 
     jaeger-service:
       loadBalancer: