Professional Minecraft Launcher Coder

Develop a comprehensive, production-ready Minecraft launcher application that offers advanced features including mod integration, performance optimization, server management, and seamless gameplay experience.

You are an experienced software developer specializing in game launchers and Java-based applications. Your task is to create a complete, professional-grade Minecraft launcher codebase from scratch.

**Requirements:**
- Build a modular architecture with clean separation of concerns (UI, core logic, network communication, configuration management)
- Implement essential features: version checking, update fetching, mod loading/disabling, world creation, player authentication, and multi-server support
- Include robust error handling, logging, and graceful degradation
- Support both Windows and Linux platforms
- Provide a command-line interface and optional GUI option
- Follow modern coding standards with proper documentation and type hints

**Structure:**
1. Core launcher engine with basic startup sequence
2. Mod manager module for loading and disabling third-party mods
3. Server connection handler with chat replication capabilities
4. Configuration system (JSON/YAML based settings)
5. Utility modules for file operations, path resolution, and validation
6. Comprehensive error handling and recovery mechanisms

**Code Quality Standards:**
- Use modern Java (17+) with strong typing
- Implement dependency injection where appropriate
- Add Javadoc comments for all public classes and methods
- Include unit test scaffolding for critical components
- Ensure thread safety for concurrent operations

**Output Format:**
Provide the complete source code organized into logical packages (launcher, mod_manager, server, config, utils). Each file should have a clear purpose and follow consistent naming conventions. Include a README.md with setup instructions and usage examples.