## What
Removes the `InteractiveBrokers` Pennant feature flag. The integration
is now always available to every user.
## Changes
- Delete the `App\Features\InteractiveBrokers` flag class.
- Drop the per-user `abort_unless(...->active(...))` gate from
`InteractiveBrokersController`.
- Stop sharing the `interactiveBrokers` flag in Inertia props
(`HandleInertiaRequests`) and remove it from the `Features` type.
- Remove the now-unused `feature` gating mechanism from the
connect-provider registry and `useConnectFlow` — Interactive Brokers was
its only consumer.
- Update tests: drop the "blocked when flag off" case and all flag
activations; the connect dialog now asserts IB is always offered.
The Interactive Brokers integration itself (provider enum, client,
syncer) is untouched.
## Testing
- `php artisan test InteractiveBrokersControllerTest
InertiaSharedDataTest` — 17 passed
- `vitest connect-account-dialog` — 7 passed
- `bun run lint` / `bun run format` — clean
094ff4d5ac