Add and update host variable files for various servers

- Created new host variable file for `iam-nd.oopen.de` with network and cron configurations.
- Created new host variable file for `test.mariadb.oopen.de` with cron environment entries.
- Updated `file-km.anw-km.netz.yml.BAK.2026-04-18-1218` with network interface configurations and DNS settings.
- Modified `gw-campus.oopen.de.yml` to change device names for network interfaces.
- Updated `nd-archiv.warenform.de.yml`, `nd-live.warenform.de.yml`, `nd.warenform.de.yml`, `web0.warenform.de.yml`, `web1.warenform.de.yml`, and `web2.warenform.de.yml` to replace `wkhtmltopdf` with `weasyprint` in the list of extra packages.
- Updated `o26.oopen.de.yml` to correct SSH key destination and change backup job script path.
- Added `iam-nd.oopen.de` to the hosts file for server management.

host_vars/o26.oopen.de.yml

@@ -262,7 +262,7 @@ root_ssh_keypair:
     priv_key_src: o26.oopen.de/root/.ssh/id_ed25519-backup
     priv_key_dest: /root/.ssh/id_ed25519-backup
     pub_key_src: o26.oopen.de/root/.ssh/id_ed25519-backup.pub
-    pub_key_dest: /root/.ssh/id_ed25519-backup
+    pub_key_dest: /root/.ssh/id_ed25519-backup.pub
 
 
 # ---
@@ -386,7 +386,7 @@ cron_user_entries:
   - name: "Remote Borg Backup"
     minute: '04'
     hour: '00'
-    job: /root/crontab/backup-rborg/rborg.sh
+    job: /root/crontab/backup-rborg2/rborg2.sh
 
   - name: "Check if SSH service is running. Restart service if needed."
     minute: '*/5'