Console-format PS5 packages (magic 0x7F "FIH") hold no readable param.sfo, so
native PS5 titles kept showing their title id twice while PS4 ones resolved.
Fall back to the system metadata when the package cannot be parsed:
/user/appmeta/<TITLE>/param.json and then /system_data/priv/appmeta, whose
localizedParameters carry the display name as plain UTF-8 (first entry = the
default language). The format is pinned by a fixture in test_http_games.