feat(api): create session on register

feat(api): increase session lifetime to 30 days

feat(api): logout endpoint

feat(api): session validation

feat(api): login password verification

WIP(api): session management

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

feat(api): init redis session backend

fix(api): check if user exists before hashing password on registration

feat(api): reimpl user registration

fix(api): skip user model password field

fix(api): NewUser -> InsertableUser

feat(api): user model

feat(api): reimpl /api/info

feat(api): embed migrations

feat(api): database connection

fix(api): timestamp -> timestamptz

feat(api): migration create_games

feat(api): migration create_actions

feat(api): migration create_gamedata