Sometimes a lighting strike is a message from a higher being (more on that later).
Are there log messages indicating that it was unable to configure the switch?
Does swconfig dev switch0 show suggest that it has been configured properly?
On that lead-in line, perhaps it's time to consider a new router to replace that 8/64 device. It won't be long until you run up against RAM problems, even with 8 MB of flash. Units with comparable performance and much greater resources are available for around US$20. Several options and opinions are in the (long) thread. Some actually have strong support for OpenWrt from the OEM, as well as attentive and active support communities.
You're making it seem like 3,000,000 Volts in a square meter...all looking for the path-of-least-resistance to Earth/Ground...in the process, passing through your router (and likely other equipment) - isn't a big deal.
Even if you were interested, I wouldn't suggest using or repairing the router. You have no way of [easily] knowing where the lightening actually traveled in the circuitry. I would consider that device a fire hazard at worse. At minimum, I wouldn't trust it to stay online much longer.
Have you opened the router, do you see any burns?
Do you notice the smell of "burnt circuitry" (I assure you, if you never smelled it, you'll know when you do)?
You may see burn marks on the board. I can say with high certainty, that [at least] the switch chip was destroyed by the surge.