Add Docker support

[davesleal]

Description

Add Docker support for easy deployment and consistent environments across platforms.

Proposed Implementation

• Create Dockerfile for the bot
• Create docker-compose.yml for multi-service setup (bot + monitoring)
• Add environment variable configuration
• Document Docker deployment in README

Benefits

• Consistent deployment across platforms
• Easy local development setup
• Simplified cloud deployment (AWS ECS, GCP Cloud Run, etc.)
• Isolated environment with dependencies

Files to Add

• Dockerfile
• docker-compose.yml
• .dockerignore
• Update SETUP_GUIDE.md with Docker instructions