Prune unused names after x months of innactivity

Suggestions
1

Imported from legacy Flarum.
Original author: StellarFlare (Flarum #319)

Prune old character names that aren’t being used so that they’re available again after.

2

Imported from legacy Flarum.
Original author: Serenity (Flarum #365)

This is already a feature and has been done previously.

https://forum.muhro.eu/d/567-patch-notes-66-20-april-2023

3

Imported from legacy Flarum.
Original author: StellarFlare (Flarum #319)

I mean, it doesn’t say it’s automatic