- Add Express server with vite-express for combined frontend/API serving
- Create modular API route structure (server/api/)
- Implement Claude API proxy with proper header injection
- Support split deployment via API_ONLY and ALLOWED_ORIGINS env vars
- Remove Claude proxy from Vite config (now handled by Express)
- Add migration plan documentation
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
