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/tasks/main.yml

@@ -76,6 +76,11 @@
     image: git.debyl.io/debyltech/fulfillr:20260124.0411
   tags: debyltech, fulfillr
 
+- import_tasks: containers/debyltech/n8n.yml
+  vars:
+    image: docker.io/n8nio/n8n:2.11.3
+  tags: debyltech, n8n
+
 - import_tasks: containers/debyltech/uptime-kuma.yml
   vars:
     image: docker.io/louislam/uptime-kuma:2.0.2