fix: use correct PostHog API host from environment variable

Changed from hardcoded '/ingest' to VITE_PUBLIC_POSTHOG_HOST env var to ensure PostHog events are sent to the correct EU endpoint.

frontend/src/main.tsx

@@ -13,13 +13,16 @@ initializeTheme();
 const queryClient = new QueryClient()
 
 const posthogOptions = {
-  api_host: '/ingest',
-  ui_host: import.meta.env.VITE_PUBLIC_POSTHOG_HOST || 'https://eu.posthog.com',
+  api_host: import.meta.env.VITE_PUBLIC_POSTHOG_HOST,
   defaults: '2026-01-30',
-  capture_exceptions: true,
-  debug: import.meta.env.DEV,
 } as const
 
+// Debug PostHog configuration
+console.log('PostHog Config:', {
+  apiKey: import.meta.env.VITE_PUBLIC_POSTHOG_KEY ? '✓ Set' : '✗ Missing',
+  apiHost: import.meta.env.VITE_PUBLIC_POSTHOG_HOST,
+})
+
 ReactDOM.createRoot(document.getElementById('root')!).render(
   <StrictMode>
     <PostHogProvider