## Summary
The incident.io status page is now the only status banner for everyone,
so the legacy status banner path is removed:
- Removed the `incidentIoStatusPage` ConfigCat flag. The incident.io
path is unconditional.
- Deleted the legacy status banner code (`StatusPageBanner` and its
utils/visibility hook) and its tests.
- Deleted the legacy API endpoints `/api/incident-banner`,
`/api/incident-status`, and `/api/status-override` (pages, app, and
routes variants), along with their data hooks, query keys, and lib
helpers.
- Removed `STATUSPAGE_*` env vars from the Turbo config and the
`INCIDENT_BANNER_DISMISSED_IDS` local storage key from
`packages/common`.
- Updated the AI tools and SQL generation endpoint that read the flag.
`NEXT_PUBLIC_ONGOING_INCIDENT` / the `ongoingIncident` override is kept.
The `incident_status_cache` table and its migration are intentionally
untouched. Studio no longer reads it, and dropping it is a separate
cleanup.
## Testing
- Studio typecheck passes.
- Related vitest suites pass (414 tests).
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