add n8n workflow automation and fix cloud backup rsync

- Add n8n container (n8nio/n8n:2.11.3) with Caddy reverse proxy at n8n.debyl.io
- Add --exclude .ssh to cloud backup rsync to prevent overwriting
  authorized_keys on TrueNAS backup targets

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ansible/roles/podman/defaults/main.yml

@@ -7,6 +7,7 @@ debyltech_path: "{{ podman_volumes }}/debyltech"
 # drone_path: removed - Drone CI decommissioned
 factorio_path: "{{ podman_volumes }}/factorio"
 fulfillr_path: "{{ podman_volumes }}/fulfillr"
+n8n_path: "{{ podman_volumes }}/n8n"
 gregtime_path: "{{ podman_volumes }}/gregtime"
 searxng_path: "{{ podman_volumes }}/searxng"
 hass_path: "{{ podman_volumes }}/hass"
@@ -77,6 +78,7 @@ bookstack_server_name: wiki.skudakrennsport.com
 cloud_server_name: cloud.bdebyl.net
 cloud_skudak_server_name: cloud.skudakrennsport.com
 fulfillr_server_name: fulfillr.debyltech.com
+n8n_server_name: n8n.debyl.io
 home_server_name: home.debyl.io
 uptime_kuma_server_name: uptime.debyltech.com
 uptime_kuma_personal_server_name: uptime.debyl.io
@@ -155,6 +157,7 @@ caddy_log_names:
   - gitea-debyl
   - gitea-skudak
   - fulfillr
+  - n8n
 
 # GeoIP configuration for Graylog
 # Requires free MaxMind account: https://dev.maxmind.com/geoip/geolite2-free-geolocation-data