Refactors the CLI structure to improve readability and maintainability:
- ♻️ Replaces `dl_fav_group` with `app_dl_fav` for better naming consistency.
- 🛠️ Restructures the `callback_app` function, removing redundancy.
- 🚀 Adds a URL detection mechanism to streamline `dl <URL>` command simulation.
- ✨ Enhances imports by adding `urlparse`.
These updates aim to simplify the codebase and improve user experience.