feat: add automatic network failover

webui/index.html

@@ -1546,6 +1546,7 @@ var CLI_KEYS=[
   ["wifi.ssid","WiFi network name",0],
   ["wifi.pwd","WiFi password",0],
   ["wifi.powersave","WiFi power-save mode",0,"none|min|max"],
+  ["link.status","Selected network, IP, signal and uptime",1],
   ["wifi.status","WiFi connection, IP, RSSI and uptime",1],
   ["mqtt.origin","Observer name in published messages",0],
   ["mqtt.iata","IATA region code used in topic paths",0],