- common/wifi.yaml: the network gets id wifi_iot, so devices can
override it with '!extend wifi_iot'
- common/ipv6_only.yaml: add-on package next to any common package;
switches to the IPv6-only SSID, wifi ipv6_only (SLAAC, no DHCPv4,
esphome/esphome#19750 as external component until merged) and
min_ipv6_addr_count: 1
- mcu-lvgl-trainer, mcu-nspanel-dev, mcu-rfid-reader, mcu-stackchan,
mcu-tft moved to the IPv6-only network
