## Summary
This PR significantly improves maintainability by breaking up the 880+ line monolithic app.ts file into smaller, focused modules with proper testing. The code is now organized into dedicated modules under the lib/app/ directory, making the codebase more maintainable and testable.
## Key changes
- Extract functionality into modules under lib/app/ directory:
- Command-line handling (cli.ts)
- Configuration loading (config.ts)
- Web server setup and middleware (server.ts)
- Core application initialization (main.ts)
- URL handlers, routing, rendering, and controllers
- Add comprehensive unit tests for all new modules
- Make compilationQueue non-optional in the compilation environment
- Improve separation of concerns with dedicated interfaces
- Ensure backward compatibility with existing functionality
- Maintain cross-platform compatibility (Windows/Linux)
## Benefits
- Improved code organization and modularity
- Enhanced testability with proper unit tests
- Better separation of concerns
- Reduced complexity in individual files
- Easier maintenance and future development
This refactoring is a significant step toward a more maintainable codebase while preserving all existing functionality.
