Complete Docker support for LeanRAG with MySQL container setup and management tools

[Copilot]

This PR completes the Docker infrastructure for LeanRAG by implementing the missing components referenced in the MYSQL_DOCKER_README.md documentation. The existing documentation described a complete Docker setup, but several key files were missing from the repository.

What was missing

The MYSQL_DOCKER_README.md file documented a comprehensive Docker setup with three deployment options, but the following critical files were missing:

• mysql-init/01-init.sql - MySQL initialization script for database setup
• mysql-docker.sh - Management script for easy container operations

Without these files, users couldn't actually use the documented Docker setup methods.

What this PR adds

1. MySQL Initialization Script (mysql-init/01-init.sql)

• Creates the leanrag_default database with proper UTF-8 configuration
• Sets up character set and collation (utf8mb4_unicode_ci) to match database_utils.py requirements
• Includes a verification table to confirm successful initialization
• Automatically executed when MySQL container starts for the first time

2. Container Management Script (mysql-docker.sh)

A comprehensive management script providing:

• start/stop/restart - Container lifecycle management
• status - Shows container health and connection details
• connect - Direct MySQL shell access
• logs - Container log viewing
• reset - Complete data cleanup and fresh start
• build - Custom image building from Dockerfile.mysql
• Colored output and error handling
• Automatic health checks and readiness detection

3. Docker Compose Updates

• Removed obsolete version attribute that was causing warnings
• Maintained all existing functionality and configuration

Testing performed

✅ Docker Compose setup - docker compose up -d mysql works correctly
✅ Management script - All commands (start, stop, status, connect, etc.) function properly
✅ Database connectivity - MySQL accessible on localhost:4321 with root/123 credentials
✅ Database integration - database_utils.py functions work correctly with Docker setup
✅ Table creation - Automatic creation of entities, relations, and communities tables
✅ Data persistence - MySQL data persists across container restarts via Docker volumes

Usage examples

Users can now choose from three documented setup methods:

# Option 1: Docker Compose (Recommended)
docker compose up -d mysql

# Option 2: Management Script
./mysql-docker.sh start
./mysql-docker.sh status
./mysql-docker.sh connect

# Option 3: Direct Docker
docker build -f Dockerfile.mysql -t leangraph-mysql .
docker run -d --name leangraph-mysql -p 4321:3306 leangraph-mysql

This implementation ensures that the LeanRAG framework now has complete, production-ready Docker support that matches the existing documentation, making it significantly easier for users to deploy and develop with the framework.

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