Add basePath /bodenfeuchte for reverse proxy deployment

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

app/page.tsx

@@ -28,7 +28,7 @@ export default function Home() {
   const [lastUpdate, setLastUpdate] = useState<string>('');
 
   const fetchData = async () => {
-    const res = await fetch('/api/data');
+    const res = await fetch('/bodenfeuchte/api/data');
     const json: Measurement[] = await res.json();
     setData(json);
     setLastUpdate(new Date().toLocaleTimeString('de-DE'));

next.config.ts

@@ -1,7 +1,7 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-  /* config options here */
+  basePath: '/bodenfeuchte',
 };
 
 export default nextConfig;