Regenerate maps using ElevationMapGenerator

- Regenerated 6 maps (excluding test_6p_flat) using built-in map generator
- Maps validated for structure, spawn positions, and terrain dimensions
- battle_arena: 256x64 ocean (2p special mode)
- crystal_caverns: 200x180 frozen (2p ranked)
- void_assault: 220x220 void (2p ranked)
- scorched_basin: 280x280 desert (4p ranked)
- contested_frontier: 360x320 jungle (6p/3v3 ranked)
- titans_colosseum: 400x400 volcanic (8p ranked)

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

Author: 2 people