fix: Use internal healthcheck instead of HTTP ping endpoint

- Change health check to use docker exec traefik healthcheck
- HTTP ping endpoint requires BasicAuth (401), internal check is more reliable
- Improves health check accuracy in restart-traefik.yml playbook

deployment/ansible/playbooks/restart-traefik.yml

@@ -56,13 +56,10 @@
       changed_when: false
       failed_when: false
 
-    - name: Check Traefik health endpoint
-      ansible.builtin.uri:
-        url: "{{ traefik_url }}/ping"
-        method: GET
-        status_code: [200]
-        validate_certs: no
-        timeout: 10
+    - name: Check Traefik health endpoint (ping endpoint requires auth, use internal check)
+      shell: |
+        cd {{ traefik_stack_path }}
+        docker compose exec -T {{ traefik_container_name }} traefik healthcheck --ping 2>&1 || echo "HEALTH_CHECK_FAILED"
       register: traefik_health
       ignore_errors: yes
       changed_when: false