feat(client): remove belly dep, disable UI for rework

wip(server, shared): dual purpose auth event

feat!(client, shared): move api calls to shared, dep shuffle,
and remove connection check stage

feat(shared): add auth message

chore(client, server, shared): update naia deps

fix(client): add TODO about server IP

feat(server): dev launch script

feat(api): increase session lifetime to 30 days

feat(api): logout endpoint

feat(api): session validation

feat(api): login password verification

feat(shared): new error UserPasswordCheckFailed

feat: nix shell

chore: generalize mold

docs: wip README.md changes

WIP(api): session management

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

docs: small doc updates

feat(api): init redis session backend

chore(api): add actix-session dep