feat(api): session validation

WIP(api): session management

fix(api): /ping -> /api/ping

feat(api): init redis session backend

feat(api): reimpl user registration

feat(api): user model

feat(api): reimpl /api/info

feat(api): embed migrations

feat(api): database connection

feat(api): init new api

chore: update licenses

feat: add shared, server, api