fix(backend): avoid uuid-text compare in unlock query

fix(critical): harden lesson access checks across subjects

fix(backend): disable caching for auth me

fix(backend): break module circular deps for deploy

fix(critical): require unlock for lesson viewer endpoints

fix(critical): enforce unlock access for lesson-type-contents APIs

fix: avoid stale lock state by checking access on tap

fix: prevent access-check failure bypass on lesson types screen

fix(critical): gate lesson types screen behind unlock check

fix(critical): per-node opens reflected in library lock state

fix(critical): clear dashboard cache on login/register/session expiry

fix: unlock sheet shows correct buttons + clear stale dashboard cache

fix: onboarding trial lesson doesn't consume daily free slots

docs(backend): clarify free-lesson quota is any lesson, not sequential

fix(backend): count daily free lesson slots correctly