- Implement `METARService` to fetch METAR data from the CheckWX API.
- Add `requests` dependency to `pyproject.toml`.
- Update `Application` to initialize and use `METARService`.
- Introduced `DirectoryManager` to handle configuration directory creation.
- Added `ConfigManager` with singleton design to manage config reading.
- Expanded argument validation in `Application` to refine error checks.
- Updated dependencies to include `rich`, `tomli`, and `tomli_w`.
- Adjusted setup logic to prompt users about missing configurations.