lab4: RabbitMQ rewrite

lab4: RabbitMQ rewrite

chore: npm run format

doc: add README

feat: do the task for lab 3

style: don't use tabs

chore: further cleanup

clarify admin users endpoint

make some fields optionable

add admin endpoint

add namespace

add pagination

add ratelimiting

add Idempotency

cleanup

add todo.db to gitignore

add API versioning