Add Docker deployment support

- Add Dockerfile for containerization
- Add docker-compose.yml for easy deployment
- Add .dockerignore to optimize build
- Add .env.example for environment configuration
- Add DOCKER_DEPLOY.md with comprehensive deployment guide

Support for:
- Local Docker deployment
- Cloud platforms (Render, Railway, Fly.io, GCP, AWS)
- Persistent storage configuration
- Health checks and monitoring

.dockerignore

@@ -0,0 +1,18 @@
+node_modules
+npm-debug.log
+.git
+.gitignore
+README.md
+.env
+.DS_Store
+*.log
+auth.json
+a-req.txt
+a-req-err.txt
+a-res.txt
+o-req.txt
+o-req-err.txt
+o-res.txt
+o2-req.txt
+auth-res.txt
+todo.md