fix(fastapi): rework cookies - do not re-emit generically

This change removes cookie re-emission of AURLANG and AURTZ, adds the AURREMEMBER cookie (the state of the "Remember Me" checkbox on login), and re-emits AURSID based on the AURREMEMBER cookie.

Previously, re-emission of AURSID was forcefully modifying the expiration of the AURSID cookie. The introduction of AURREMEMBER allows us to deduct the correct cookie expiration timing based on configuration variables. With this addition, we now re-emit the AURSID cookie with an updated expiration based on the "Remember Me" checkbox on login.

Signed-off-by: Kevin Morris kevr@0cost.org