dns/ddclient: Add Multihostname support for netcup #4268
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This update enables support for multiple hostnames when using the Netcup provider for ddclient. As the documentation states:
"Hostname(s): A list of fully qualified domain names to update via the selected service, separated by commas. For example: subdomain.example.com."
Since ddclient provides a text field for multiple hostnames, I wanted to avoid creating each one individually. This enhancement allows the use of that property while also reducing the number of queries—for example, by performing only a single login.
The update is fully backward-compatible, ensuring that existing settings continue to work. I have tested it extensively, and it runs reliably.
This version improves readability, removes redundancy, and makes the explanation more natural and professional. 🚀
closes #3966