- Add `username` column to the `user` table and enforce uniqueness constraint.
- Introduce new SQL migration file for the `username` addition.
- Update `schema.ts` to reflect changes in the `user`, `session`, and `account` tables.
- Enhance authentication client by integrating `usernameClient` plugin for better user management.
- Adjust session management settings for improved caching and freshness.
- Refactor metadata generation in the home page for consistency.