The Portal image plugin registered `provider_name="nous"` and rendered its own
"Nous Portal (image)" picker row. Selecting it wrote the same `image_gen.provider: nous`
as the managed FAL row, so both rows showed [active] for any managed selection and the
Portal pick was actually served by FAL.
The managed row is now the only Nous row (`imagegen_backend: "nous"`); its model picker
is the FAL + Krea + Portal union, filtered to the gateways the account is funded for
(free-pool accounts see FAL only). The Portal provider stays registered for pets but
no longer renders a row. CLI picker and dashboard model endpoints share the catalog.
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