Only remove PatchExtractor.nro on exit when the Done screen was reached;
early quit no longer deletes the NRO. Drop the ineffective mid-run self-delete.
Replace the console UI with a Borealis-based flow, bundle ROMFS assets and
borealis as a submodule, and apply small upstream patches at build time.
Self-delete runs after romfsExit on quit so the NRO can be removed like the
old console build.
