Add routing mode that avoids roads that have the sun directly in your eyes

E.g. if the sun is setting in the West and at that "perfect angle", then prefer roads that will not result in your car pointing directly at the sun if there are reasonable alternatives, even if they might take a bit longer.

The issue does not identify any files, tests, or entry points, so first locate the routing implementation and how routing modes are defined. Review how route alternatives and travel direction are evaluated, then confirm that the new mode prefers reasonable routes that avoid facing directly into the sun when alternatives exist.

Written by the indexing model from the issue text.