Drops the feature-flags module, the /api/features endpoint and its test in
favour of calling api.assistant.getAvailability() from the root layout, the
same way the layout already calls api.user.getById().
The gate only needs one server-resolved boolean, and getAvailability
already computes exactly that. The separate helper duplicated the enabled /
modelId / api-key-required rule, so the two copies could drift.
A general feature-flag surface is still worth having, but it belongs at
boot time across every optional feature rather than as a per-request
database read introduced alongside the assistant.
Thomas Camlong
7276bdad21