Moves the three per-tile zone-manifest handlers (--add-tile,
--remove-tile, --list-tiles) out of main.cpp into a new
cli_tiles.{hpp,cpp} module. Zones can span multiple ADT tiles;
these manage that list — add creates a fresh blank WHM/WOT
pair at the new tile, remove drops the entry + deletes
WHM/WOT/WOC files, list prints the manifest with file-presence
flags.
main.cpp shrinks by 185 lines (4,616 to 4,431).
