feat: add AutoMQ integration quickstart demo

[lyx2000]

Summary

Added a complete quickstart demo showcasing Lightstreamer Kafka Connector integration with AutoMQ, a cloud-native Kafka distribution with S3-based storage.

What's Added

• Complete AutoMQ Demo Setup: New quickstart example in examples/vendors/automq/quickstart-automq/
• AutoMQ Broker Configuration: Single-node AutoMQ cluster with KRaft mode and S3 storage backend
• S3 Storage Integration: MinIO as S3-compatible storage for AutoMQ data and operational metadata
• Monitoring Dashboard: Kafka UI for cluster monitoring and management
• Production-Ready Configuration: Proper network setup, health checks, and service dependencies

Key Features

• Cloud-Native Architecture: Demonstrates AutoMQ's compute-storage separation
• S3-Based Storage: Cost-effective storage with automatic bucket management
• Real-Time Streaming: Live stock data streaming from Kafka to web clients via Lightstreamer
• Easy Deployment: Single-command Docker Compose setup
• Built-in Monitoring: Integrated Kafka UI accessible at http://localhost:12000

Services Included

• AutoMQ Kafka cluster (automqinc/automq:latest)
• MinIO S3-compatible storage
• Lightstreamer Kafka Connector
• Sample data producer
• Kafka UI for monitoring

Testing

• Verified complete stack deployment
• Tested real-time data streaming functionality
• Confirmed S3 storage integration
• Validated monitoring dashboard access