feat: add new functionality

feats(todo.md): add task to implement Rest API

chore(deps): update dependencies, remove unused packages

feat(app): add Student Management System with modern features and robust architecture.

refactor(service-worker): remove Firebase messaging service worker file

refactor(.gitignore): update firebase-config to firebase-key, add firebase-messaging-sw

Add Firebase admin SDK JSON to .gitignore

Add firebase-key.json to .gitignore

refactor(login): remove pattern and title attributes from username input, add form validation on submit

refactor(admin_dashboard.js): improve getCSRFToken function with additional token sources

add: firebase-messaging service worker for notifications (v1.0.2)

refactor(backends): try authenticating as superuser/admin and staff by phone first

```

refactor(.gitignore): exclude @firebase-key.json, add @firebase-messaging-sw.js and @firebase-config.js to .gitignore

refactor(.env.example): simplify and document environment variables