feat(docker): add Docker deployment configuration

Add production-ready Docker setup with multi-stage Dockerfile, docker-compose
orchestration for API, PostgreSQL, Redis, and Nginx services. Includes
health checks, non-root user execution, and proper networking.

- Add multi-stage Dockerfile with gunicorn/gevent workers
- Add docker-compose.yml with api, db, redis, nginx services
- Add nginx reverse proxy configuration with security headers
- Update .env.example with Docker and production variables
- Add email provider configuration (Mailgun, SendGrid)
- Add requests dependency for HTTP client support
- Update documentation with Docker deployment guide
- Rebrand project name from Gatehouse to Secuird

scripts/configure_oauth_provider.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 """
-OAuth Provider Configuration Script for Gatehouse
+OAuth Provider Configuration Script for Secuird
 
 This script allows administrators to configure OAuth providers at the application level
 using the new ApplicationProviderConfig architecture.
@@ -457,7 +457,7 @@ def delete_provider(args):
 def main():
     """Main entry point for the script."""
     parser = argparse.ArgumentParser(
-        description="Configure OAuth providers for Gatehouse authentication",
+        description="Configure OAuth providers for Secuird authentication",
         formatter_class=argparse.RawDescriptionHelpFormatter,
         epilog="""
 Examples: