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/weapons/weapon_server.gd

@@ -20,6 +20,9 @@
 class_name WeaponServer
 extends Node
 
+# Preload dependencies for headless compat
+const _wd = preload("res://scripts/combat/weapon_definitions.gd")
+
 # ---------------------------------------------------------------------------
 # State shape
 # ---------------------------------------------------------------------------
@@ -46,7 +49,7 @@ var physics_world: World3D = null
 ## Optional LagCompensation controller for server-side rewinding.
 ## When set, _perform_hitscan uses lag-compensated raycasting;
 ## otherwise it uses the current-frame physics world directly.
-var lag_compensation: LagCompensation = null
+var lag_compensation = null
 
 # ---------------------------------------------------------------------------
 # Lifecycle
@@ -81,7 +84,7 @@ func unregister_player(player_id: int) -> void:
 ## Also calls register_player implicitly.
 func give_weapon(player_id: int, weapon_id: String) -> void:
     register_player(player_id)
-    var data := WeaponDefinitions.get_weapon(weapon_id)
+    var data := _wd.get_weapon(weapon_id)
     if data == null:
         push_warning("WeaponServer: unknown weapon '%s'" % weapon_id)
         return
@@ -105,7 +108,7 @@ func get_ammo_info(player_id: int, weapon_id: String) -> Dictionary:
     var st := get_weapon_state(player_id, weapon_id)
     if st.is_empty():
         return {}
-    var data := WeaponDefinitions.get_weapon(weapon_id)
+    var data := _wd.get_weapon(weapon_id)
     return {
         ammo = st.get("ammo", 0),
         reserve = st.get("reserve", 0),
@@ -119,7 +122,7 @@ func get_ammo_info(player_id: int, weapon_id: String) -> Dictionary:
 ## Returns true if the player can fire the specified weapon right now.
 ## Checks: weapon known, ammo available, not reloading, cooldown elapsed.
 func can_fire(player_id: int, weapon_id: String) -> bool:
-    var data := WeaponDefinitions.get_weapon(weapon_id)
+    var data := _wd.get_weapon(weapon_id)
     if data == null:
         return false
 
@@ -153,7 +156,7 @@ func can_fire(player_id: int, weapon_id: String) -> bool:
 
 ## Start reloading the player's weapon. Returns true if reload initiated.
 func start_reload(player_id: int, weapon_id: String) -> bool:
-    var data := WeaponDefinitions.get_weapon(weapon_id)
+    var data := _wd.get_weapon(weapon_id)
     if data == null:
         return false
 
@@ -196,7 +199,7 @@ func process_reloads(player_id: int, delta: float) -> bool:
     return any_completed
 
 func _complete_reload(player_id: int, weapon_id: String, st: Dictionary) -> void:
-    var data := WeaponDefinitions.get_weapon(weapon_id)
+    var data := _wd.get_weapon(weapon_id)
     if data == null:
         return
 
@@ -227,7 +230,7 @@ func _complete_reload(player_id: int, weapon_id: String, st: Dictionary) -> void
 ## }
 ##
 func fire(tick: int, player_id: int, weapon_id: String, origin: Vector3, direction: Vector3) -> Dictionary:
-    var data := WeaponDefinitions.get_weapon(weapon_id)
+    var data := _wd.get_weapon(weapon_id)
     if data == null:
         return _miss_result(weapon_id)