refactor(socket.io): complete rewrite to manage dynamic rooms and seeding better

backend/socket.io/socket.manager.ts

@@ -0,0 +1,10 @@
+let hasMembersFn: ((roomId: string) => boolean) | null = null;
+
+export const registerHasRoomMembers = (fn: (roomId: string) => boolean) => {
+	hasMembersFn = fn;
+};
+
+export const hasRoomMembers = (roomId: string) => {
+	if (!hasMembersFn) return false;
+	return hasMembersFn(roomId);
+};