fix: server startup failures in Node 24

- Remove unused MapWithMode type in MapPlaylist.ts (TS2304 error)
- Make Client.ws mutable to allow reassignment on rejoin (TS2540 error)
- Add cluster.setupPrimary() for ESM compatibility in Node 24

Author: Gajesh2007

src/server/Client.ts

@@ -18,7 +18,7 @@ export class Client {
     public readonly flares: string[] | undefined,
     public readonly ip: string,
     public readonly username: string,
-    public readonly ws: WebSocket,
+    public ws: WebSocket,
     public readonly walletAddress: string | null,
     public readonly cosmetics: PlayerCosmetics | undefined,
     public readonly isRejoin: boolean = false,

src/server/MapPlaylist.ts

@@ -45,8 +45,6 @@ const frequency: Partial<Record<GameMapName, number>> = {
 };
 
 export class MapPlaylist {
-  private mapsPlaylist: MapWithMode[] = [];
-
   constructor(private disableTeams: boolean = false) {}
 
   public gameConfig(): GameConfig {

src/server/Server.ts

@@ -1,5 +1,6 @@
 import cluster from "cluster";
 import * as dotenv from "dotenv";
+import { fileURLToPath } from "url";
 import { GameEnv } from "../core/configuration/Config";
 import { getServerConfigFromServer } from "../core/configuration/ConfigLoader";
 import { Cloudflare, TunnelConfig } from "./Cloudflare";
@@ -10,6 +11,13 @@ import { startWorker } from "./Worker";
 // Load environment variables FIRST
 dotenv.config();
 
+// Setup cluster for ESM - required for Node 24+ with ESM loaders
+if (cluster.isPrimary) {
+  cluster.setupPrimary({
+    exec: fileURLToPath(import.meta.url),
+  });
+}
+
 const config = getServerConfigFromServer();
 
 // Validate environment variables based on the current environment