- team_data.gd: Team enum (SPECTATOR/CT/Terrorist), constants for names,
colors, starting money, and spawn groups; TeamData resource class
- team_manager.gd: Player-to-team assignment, auto-balancing, score
tracking; round-independent (persists across rounds)
- spawn_manager.gd: Scans scene for Marker3D nodes in spawn_points_ct
and spawn_points_t groups; selects valid spawns (farthest from enemies
with proximity check, fallback to first available)
- buy_zone.gd: Area3D-based trigger zone with team filtering, player
enter/exit tracking and signals
- test_range.tscn: Added 2 CT spawn markers and 2 T spawn markers with
appropriate groups
