feat: add authentication modal component and user authentication logic

- Implemented AuthModal.vue for user login and registration with form handling.
- Created useAuth composable for managing user state and authentication requests.
- Added admin route middleware to protect admin routes.
- Developed admin login page with authentication checks.
- Implemented API endpoints for user management (login, logout, fetch user, register).
- Created database migrations for users table and updated movies table.
- Added utility functions for password hashing and JWT token management.

server/database/migrations/0004_opposite_sasquatch.sql

@@ -0,0 +1 @@
+ALTER TABLE `movies` ADD `api_updated_at` timestamp;