- Moved IMAP credentials from query parameters to the request body for the test-connection endpoint.
- Created missing `__init__.py` files across `backend/app/` to fix CI `ModuleNotFoundError`.
- Reformatted `setup.py` and `user.py` using `black` to pass lint checks.
- Addressed Pylint warnings in `imap.py` (unused arguments, lazy logging, exception chaining).
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>