feat: init browser pool and io shared instance

src/shared/instances.ts

@@ -0,0 +1,21 @@
+import { BrowserPool } from "../../server/src/browser-management/classes/BrowserPool"
+import { Server } from "socket.io";
+import http from 'http';
+
+/**
+ * Shared browser pool instance
+ */
+export const browserPool = new BrowserPool();
+
+/**
+ * Shared socket.io instance - will be initialized by the main server
+ */
+export let io: Server;
+
+/**
+ * Initialize the socket.io instance (called only by main server)
+ */
+export function initializeSocketIO(server: http.Server): Server {
+  io = new Server(server);
+  return io;
+}