Improve networking

server/game/host_protocol.ts

@@ -1,4 +1,4 @@
-import type { ModData, ModListing } from "$/common/mod_loader.ts";
+import type { AtlasListing, ModData, ModListing } from "$/common/mod_loader.ts";
 
 // messages between server/main.ts (the host) and the game server worker
 
@@ -7,6 +7,7 @@ export type HostToGame =
 		type: "init";
 		save: string | undefined;
 		default_seed: string;
+		atlas: AtlasListing;
 		// in load order, with the scripts' code since the worker can't read files
 		mods: { listing: ModListing; data: ModData; server_code?: string; worldgen_code?: string }[];
 	}