fix: Remove debug logs & fix favicon for production

- Remove all debug logs (127.0.0.1:7242) that cause errors in production
- Fix site.webmanifest to use existing SVG icons instead of missing PNG files
- Build erfolgreich

client/src/main.tsx

@@ -3,12 +3,6 @@ import { createRoot } from 'react-dom/client'
 import './index.css'
 import App from './App.tsx'
 
-// #region agent log
-try {
-  fetch('http://127.0.0.1:7242/ingest/4fa7412d-6f79-4871-8728-29c37c9e5772',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({location:'main.tsx:8',message:'App starting',data:{rootExists:!!document.getElementById('root')},timestamp:Date.now(),sessionId:'debug-session',runId:'run1',hypothesisId:'C'})}).catch(()=>{});
-} catch(e) {}
-// #endregion
-
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
     <App />