Fix: Update authentik Caddy template to use HTTP backend

- Change reverse_proxy from https:// to http:// backend
- Use authentik_http_port instead of authentik_https_port
- Remove unnecessary TLS transport configuration
- Remove health check for non-existent endpoint

This aligns the Ansible template with the working configuration
where authentik only serves HTTP internally and Caddy handles SSL.

roles/authentik/templates/authentik.env.j2

@@ -15,6 +15,7 @@ AUTHENTIK_CACHE__URL=unix://{{ valkey_unix_socket_path }}?db={{ authentik_valkey
 AUTHENTIK_SECRET_KEY={{ authentik_secret_key }}
 AUTHENTIK_LOG_LEVEL={{ authentik_log_level }}
 AUTHENTIK_ERROR_REPORTING__ENABLED={{ authentik_error_reporting | lower }}
+AUTHENTIK_URL=https://{{authentik_domain}}
 
 # Security Configuration
 AUTHENTIK_COOKIE_DOMAIN={{ authentik_domain }}