Fix headless class_name dependencies

- Replaced TeamData.Team type hints with int in all scripts
- Added explicit preloads for headless mode class resolution
- Created stub LagCompensation and DamageProcessor scripts
- Fixed PluginManager, SpawnManager, EconomyManager, BuyZone,
  RoundManager, BuyMenuHandler, BombObjective class_name references
- Updated server config to match ServerConfig.gd format

Gray screen root cause: server scripts failed to parse in headless
mode due to Godot 4 class_name loading order (Resource after Node),
leaving server_main.gd non-functional — accepted connections but
never spawned players.

server/scripts/objectives/bomb_objective.gd

@@ -24,6 +24,9 @@
 extends Node
 class_name BombObjective
 
+# Preload for headless compat
+const _td = preload("res://scripts/teams/team_data.gd")
+
 # ---------------------------------------------------------------------------
 # Signals
 # ---------------------------------------------------------------------------
@@ -422,13 +425,13 @@ func _is_round_live() -> bool:
 func _is_player_terrorist(player_id: int) -> bool:
 	if team_manager == null:
 		return false
-	return team_manager.get_player_team(player_id) == TeamData.Team.TERRORIST
+	return team_manager.get_player_team(player_id) == _td.Team.TERRORIST
 
 ## Check if a player (by peer ID) is on the Counter-Terrorist team.
 func _is_player_counter_terrorist(player_id: int) -> bool:
 	if team_manager == null:
 		return false
-	return team_manager.get_player_team(player_id) == TeamData.Team.COUNTER_TERRORIST
+	return team_manager.get_player_team(player_id) == _td.Team.COUNTER_TERRORIST
 
 ## Check if a player is inside any registered bombsite.
 ## Iterates bomb sites and checks if the player's body overlaps.