fix: Windows client compile errors — get_world_3d on Node, array type mismatch, null plugin guard, maps format

server/scripts/game_server.gd

@@ -109,7 +109,7 @@ func _ready() -> void:
 	# These work alongside the C++ SimulationServer for the GDScript
 	# weapon path.
 	weapon_server = WeaponServer.new()
-	weapon_server.physics_world = get_world_3d()
+	weapon_server.physics_world = get_viewport().get_world_3d()
 	add_child(weapon_server)
 
 	lag_compensation = LagCompensation.new()
@@ -177,7 +177,10 @@ func _ready() -> void:
 
 	# Register bomb sites from the scene tree
 	if is_inside_tree():
-		var bomb_sites: Array[Area3D] = get_tree().get_nodes_in_group("bomb_sites")
+		var bomb_sites: Array[Area3D] = []
+		for n in get_tree().get_nodes_in_group("bomb_sites"):
+			if n is Area3D:
+				bomb_sites.append(n)
 		if bomb_sites.size() > 0:
 			bomb_objective.register_bomb_sites(bomb_sites)
 			print("[GameServer] Registered %d bomb sites with BombObjective" % bomb_sites.size())