firewall rule editing - we can create firewalls but rules are read-only

[DevGonzi]

you can create a firewall and delete a firewall. you can look at its rules.

you cannot add rules, remove rules, or do anything useful with a firewall.

hetzner api supports full rule management, we just never built it.

need:

• add inbound/outbound rules (protocol, port range, source/dest CIDRs)
• delete existing rules
• apply/remove firewall from servers