Moved login route and logic from app.py to application/auth/routes.py under the 'auth' blueprint. Updated all references to the login route to use 'auth.login'. Added a dedicated login.html template under application/auth/templates. Adjusted login_required utility and default_return logic for consistency.
Moved the login_required logic to a new utils.py for reuse. Added a new auth blueprint and registered it in app.py. Updated user blueprint to use the shared login_required function.
