- Replace complex Express-style handler with simple module.exports
- Add separate API endpoints for better organization
- Simplify vercel.json routing configuration
- Remove ES modules to use CommonJS for Vercel compatibility
- Add dedicated test API endpoint for debugging
- Convert Express app to Vercel serverless function
- Add missing /api/files/public endpoint
- Optimize static file routing with proper caching
- Remove unnecessary dependencies for faster cold starts
- Add comprehensive debugging and error handling
- Improve API response times and user experience
