feat(pulsenode): move traefik into Services as a service widget

Matches pulsenode v0.4.3, which folded the dedicated traefik widget
type into the same combined docker+API pattern as the other six
services. No apiUrl needed anymore - base URL is derived from
containerName like every other service widget.

pulsenode/config/config.yml

@@ -10,15 +10,16 @@ groups:
       - type: system
         interval: 5s
 
-      - type: traefik
+  - name: Services
+    widgets:
+      - type: service
+        service: traefik
         name: Traefik
-        apiUrl: http://traefik:8080/api
+        containerName: traefik
         icon: traefik
         href: https://${TRAEFIK_HOST_TRAEFIK}
         interval: 15s
 
-  - name: Services
-    widgets:
       - type: service
         service: coolify
         name: Coolify