Megaminx edge orientation

Orient the last-layer edges: 3 cases.

Source: SpeedCubeDB, https://speedcubedb.com/a/Megaminx/MegaminxEO, retrieved 2026-10-24: case names, groups, setups and images, and the top-voted algorithms per case with their votes. Every algorithm shown was checked by the logic engine; rejected ones are listed in docs/db-exclusions.md.