services/homebox.md gets auto-appended to Homebox's generated README
by write_readme(). Covers the installer's own opt-in fix plus a fully
manual UI walkthrough and a direct curl/API path, for anyone who'd
rather not paste a token into the installer or who's confirmed a
multi-collection setup isn't worth chasing through it.
UI navigation (collection selector -> Collection options -> Entity
Types tab, /collection/entity-types) confirmed against Homebox's own
frontend source rather than guessed.
