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.

hosts

@@ -163,6 +163,7 @@ o15.oopen.de
 
 o17.oopen.de
 test.mx.oopen.de
+test.mariadb.oopen.de
 
 # Exil e.V.
 o18.oopen.de
@@ -283,6 +284,7 @@ mm-rav.oopen.de
 o43.oopen.de
 formbricks-nd.oopen.de
 keycloak-nd.oopen.de
+iam-nd.oopen.de
 prometheus-nd.oopen.de
 web-nd.oopen.de
 test-nd.oopen.de
@@ -500,6 +502,7 @@ mm-rav.oopen.de
 o43.oopen.de
 formbricks-nd.oopen.de
 keycloak-nd.oopen.de
+iam-nd.oopen.de
 prometheus-nd.oopen.de
 web-nd.oopen.de
 test-nd.oopen.de
@@ -940,6 +943,7 @@ mm-rav.oopen.de
 
 # o43 - ND prometheus, web
 keycloak-nd.oopen.de
+iam-nd.oopen.de
 prometheus-nd.oopen.de
 web-nd.oopen.de
 
@@ -1081,6 +1085,7 @@ mm-rav.oopen.de
 
 # o43 - ND app
 keycloak-nd.oopen.de
+iam-nd.oopen.de
 prometheus-nd.oopen.de
 
 
@@ -1701,6 +1706,7 @@ mm-rav.oopen.de
 
 # o43 - ND 
 keycloak-nd.oopen.de
+iam-nd.oopen.de
 prometheus-nd.oopen.de
 web-nd.oopen.de
 test-nd.oopen.de
@@ -1942,6 +1948,7 @@ mm-rav.oopen.de
 o43.oopen.de
 formbricks-nd.oopen.de
 keycloak-nd.oopen.de
+iam-nd.oopen.de
 prometheus-nd.oopen.de
 web-nd.oopen.de
 test-nd.oopen.de