the `next-server` and `bootfile` options in dnsmasq

[kimi]

https://openwrt.org/docs/guide-user/base...#tftp_boot
https://openwrt.org/docs/guide-user/base...ng_options

Code:

uci set dhcp.linux="boot"
uci set dhcp.linux.filename="iventoy_loader_16000_uefi"
uci set dhcp.linux.serveraddress="192.168.1.69"
uci set dhcp.linux.servername="xxxx"
uci commit dhcp
/etc/init.d/dnsmasq restart