fal's LTX 2.5 fast endpoints accept 6-20s only up to 1080p — "At 1440p and
2160p, all frame rates support up to 10 seconds" — so a 4K request with the
family's 20s ceiling was rejected by the vendor. Families can now declare
`duration_cap_by_resolution`, applied after the enum snap / range clamp on the
resolved resolution enum.
An unset duration on a duration_enum family also snapped to enum[0] (6s),
silently overriding the endpoint's own "auto" default; None now omits the key
for enum families exactly as it already did for range families.
test_managed_media_gateways asserts the alibaba/happy-horse/ namespace by
prefix rather than the exact v1.1 literal so the next version bump doesn't
flip an unrelated gateway test.
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