Web UI to reboot to another partition (for Linksys/ZyXEL dual-partition routers) and to power off/power down

Please consider adding Linksys E7350:

root@OpenWrt:/etc/config# ubus call system board
{
	"kernel": "5.15.110",
	"hostname": "OpenWrt",
	"system": "MediaTek MT7621 ver:1 eco:3",
	"model": "Linksys E7350",
	"board_name": "linksys,e7350",
	"rootfs_type": "squashfs",
	"release": {
		"distribution": "OpenWrt",
		"version": "SNAPSHOT",
		"revision": "r22848-7890dd75ad",
		"target": "ramips/mt7621",
		"description": "OpenWrt SNAPSHOT r22848-7890dd75ad"
	}
}
root@OpenWrt:/etc/config# cat /tmp/sysinfo/board_name
linksys,e7350
root@OpenWrt:/etc/config# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00080000 00020000 "Boot"
mtd1: 00080000 00020000 "Config"
mtd2: 00080000 00020000 "Factory"
mtd3: 03000000 00020000 "firmware"
mtd4: 00400000 00020000 "kernel"
mtd5: 02c00000 00020000 "ubi"
mtd6: 03000000 00020000 "alt_firmware"
mtd7: 00080000 00020000 "cbtinfo"
root@OpenWrt:/etc/config# fw_printenv
baudrate=115200
boot_ver=V0.2
bootcmd=mtkautoboot
bootdelay=0
bootimage=1
bootmenu_0=Startup system (Default)=mtkboardboot
bootmenu_1=Upgrade firmware=mtkupgrade fw
bootmenu_2=Upgrade bootloader=mtkupgrade bl
bootmenu_3=Upgrade bootloader (advanced mode)=mtkupgrade bladv
bootmenu_4=Load image=mtkload
bootmenu_5=Upgrade firmware with code pattern=mtkupgrade pfw
fdtcontroladdr=8ffece60
ipaddr=192.168.1.1
netmask=255.255.255.0
serverip=192.168.1.2
stderr=uartlite0@1e000c00
stdin=uartlite0@1e000c00
stdout=uartlite0@1e000c00
bootcount=0
root@OpenWrt:/etc/config# 

Let me know if I can contribute any testing or extra info.

Thank you!
Geraud.