Add debug logging for static files directory

- Check if static files exist in production
- Log static files path and directory contents
- Help diagnose HF Spaces static file serving issue

crossword-app/backend/src/app.js

@@ -63,6 +63,17 @@ app.use('/api', apiRoutes);
 // Serve static files in production
 if (process.env.NODE_ENV === 'production') {
   const staticPath = path.join(__dirname, '../public');
+  console.log(`Static files path: ${staticPath}`);
+  
+  // Check if static files exist
+  const fs = require('fs');
+  try {
+    const files = fs.readdirSync(staticPath);
+    console.log(`Static files found:`, files);
+  } catch (error) {
+    console.error(`Error reading static files directory:`, error.message);
+  }
+  
   app.use(express.static(staticPath));
   
   // Handle React Router routes - serve index.html for non-API routes