Add support for configuring IPv4 and IPv6 public network interfaces when creating servers through the Hetzner integration. Users can now enable or disable IPv4 and IPv6 independently, with both enabled by default.
Features:
- Added enable_ipv4 and enable_ipv6 checkboxes in the server creation form
- Both options are enabled by default as per Hetzner best practices
- IPv4 is preferred when both are enabled
- Fallback to IPv6 when only IPv6 is enabled
- Proper validation and error handling for network configuration
- Comprehensive test coverage for IP address selection logic
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Co-Authored-By: Claude <noreply@anthropic.com>
