feat: Convert gRPC relay to production-ready service

[MikeSofaer]

• Add Docker and systemd deployment support

• Implement comprehensive logging system

• Add environment variable configuration

• Create deployment documentation

• Add service management scripts

The service now supports:

• Local development with Docker and ngrok

• Production deployment via Docker or systemd

• Structured logging with both file and stdout output

• Environment-based configuration

• Easy deployment and maintenance

This change makes the service ready for production deployment while maintaining local development capabilities.

Description

Closes: #XXXX

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