fix: extract createBunWebSocket to avoid circular import

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/server/src/index.ts

@@ -2,8 +2,8 @@ import { env } from "@haushaltsApp/env/server";
 import { Hono } from "hono";
 import { cors } from "hono/cors";
 import { logger } from "hono/logger";
+import { injectWebSocket } from "./ws/bun-ws";
 import { registerRoutes } from "./routes";
-import { injectWebSocket } from "./ws/shopping-ws";
 
 const app = new Hono();