Fixes the high-severity finding that RequestToAddSection's internal
useRequestSearch call was not gated on discoveryEnabled, allowing
/api/v1/requests/search and TMDB lookups to fire for users without
request access. The plan now (1) passes { enabled: discoveryEnabled }
to the section's hook, (2) gates the parent mount in GlobalSearch and
Catalog on canRequest.discoveryEnabled as defense in depth, and (3)
adds tests asserting both the enabled forwarding and the no-mount
behavior when discovery is disabled.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
