Removed the redundant local re-import of `get_settings_manager` inside the `quick_summary` API endpoint (it was already bound at module level), eliminating the same import-shadowing anti-pattern fixed for `get_user_db_session` — so `patch("...web.api.get_settings_manager")` now reliably intercepts. Both helpers are now module-level for one consistent patch surface; only `quick_summary` itself remains a local import (it pulls in the research stack, which would cycle).
