feat(games): register chess plugin on server startup

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bot/index.ts

@@ -3,9 +3,14 @@ import { env } from "@shared/lib/env";
 import { join } from "node:path";
 import { initializeConfig } from "@shared/lib/config";
 import { registerDomainEventListeners } from "@shared/lib/eventWiring";
+import { gameRegistry } from "@shared/games/registry";
+import { chessPlugin } from "@shared/games/chess/plugin";
 
 import { startWebServerFromRoot } from "../api/src/server";
 
+// Register game plugins
+gameRegistry.register(chessPlugin);
+
 // Initialize config from database
 await initializeConfig();