Allow Custom DHCP Range for Isolated Guest Networks

Currently, in isolated guest networks (with Source NAT), DHCP ranges are automatically derived from the network CIDR and cannot be explicitly defined.

Currently, users rely on CIDR adjustments by editing the network after it is created. It would be beneficial to allow administrators to directly specify the desired DHCP range during network creation for better flexibility and usability.

This feature would allow administrators to explicitly specify a DHCP range (e.g., 192.168.100.10 - 192.168.100.200) at the time of isolated guest network creation.

Comienza rastreando la creación de redes de invitados aisladas y dónde se derivan los rangos DHCP del CIDR de red. Define cómo se acepta durante la creación un rango proporcionado explícitamente, como 192.168.100.10–192.168.100.200, y luego verifica que el rango solicitado se conserve y se use para la configuración de DHCP.

Escrito por el modelo de indexación a partir del texto del issue.