Add customizable sender name for emails - shows in recipient inbox instead of default

Add email format and DNS validation to detect invalid emails before sending

Add password protection with APP_PASSWORD environment variable

Add email verification and failed email detection with detailed error display

Trigger build

Configure for Hugging Face Spaces deployment with Docker

Update frontend to use Railway URL and configure CORS for Vercel

Add Procfile for Railway deployment

Remove Railway configuration, preparing for cPanel deployment

Add Railway deployment configuration

Initial commit: Certificate Generator App with FastAPI and React