chore: simplify and fix naming for save settings endpoints
- Renamed `save_dropbox_settings` inside `app/api/google_drive.py` to `save_google_drive_settings` to fix a copy-paste naming error. - Extracted duplicate `.env` file updating logic from `app/api/google_drive.py`, `app/api/onedrive.py`, and `app/api/dropbox.py` into a new reusable helper function `update_env_file` inside `app/utils/settings_service.py`. - Refactored the three API endpoints to use the new helper function, significantly reducing complexity and code duplication. - Updated relevant test files (`tests/test_api_google_drive_final.py`) to reflect the new function name. Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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