Added complete backend infrastructure with:
- Authentication system with OAuth (Google, GitHub, Apple)
- Stripe payment processing with subscription management
- Testimonials management API
- Usage statistics tracking
- Email communication services
- Health monitoring endpoints
- Database migrations with Alembic
- Comprehensive API documentation
All APIs are production-ready with proper error handling,
security measures, and environment variable configuration.
Co-Authored-By: Claude <noreply@anthropic.com>
