Backend commit 37a4cf900 (hermes-agent) flipped the default of
GET /api/model/options's include_unconfigured parameter from true
to false, so the mobile Models picker was silently regressing to
showing only configured/authenticated providers — the skeleton rows
for unconfigured providers (with setup-hint warnings) stopped arriving.
Add include_unconfigured as a @Query param defaulting to true so the
full provider universe is restored on the Models screen. Both current
call sites (ModelViewModel + ProfilesViewModel) invoke the API without
passing the new param, so they automatically pick up the true default.