Introduces a change password route, form, and template, allowing authenticated users to update their password. Updates the User model with a method to set the must_change_password flag. Adjusts login and navigation logic to support the new flow and ensures users are redirected to change their password if required.
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.
