- Introduce `valid_path_strict` rule in `OSPOSRules` to enforce stricter path validation, preventing security issues like injection attempts with newline or special characters.
- Update mail configuration validation in `Config` controller to use the new rule for the `mailpath` field.
- Add unit tests in `OSPOSRulesTest` to cover edge cases for `valid_path_strict`.
Signed-off-by: objecttothis <17935339+objecttothis@users.noreply.github.com>