Add .ts extension to queryClient import for Docker compatibility

The Docker build environment requires explicit .ts extension
for the path alias resolution to work correctly.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

client/src/App.tsx

@@ -1,5 +1,5 @@
 import { Switch, Route } from "wouter";
-import { queryClient } from "@/lib/queryClient";
+import { queryClient } from "@/lib/queryClient.ts";
 import { QueryClientProvider } from "@tanstack/react-query";
 import { Toaster } from "@/components/ui/toaster";
 import { TooltipProvider } from "@/components/ui/tooltip";