Best route to get power to mini split
Since you are running your lineset inside run your power along with the line set.
Conduit up the wall from the panel enter the house and change over to NM cable. Or run n conduit inside your choice.
Run to the back wall. Most Electrician’s will use an LB conduit body to enter the home (and or exit). Run down to your disconnect with conduit.
To me that sounds like the cleanest install but you can run your conduit at the foundation. There is less chance of the conduit getting damaged up and inside schedule 40 pvc conduit inside would not be that hard to put in. Schedule 80 will be needed at the foundation level of using pvc. EMT can be used in both locations also. I prefer emt over pvc I think it is easier for sizes under 1” but that’s just an opinion many people use pvc. Note; You will probably need an expansion joint with pvc outside along the foundation.