List Eclipses

Every UPCOMING central eclipse, with metadata for the picker.

Past eclipses are filtered out: this list drives a "which eclipse are you chasing" picker, and an eclipse that has already happened is never the answer. include_past=true returns the full bundled set for a trip still pinned to one that has been and gone. The per-date endpoints (/path/{date}, /point, /elements/{date}) are deliberately NOT filtered, so such a trip still renders.