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## 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.