Refactor Monolith to Modular Architecture

Refactor this monolithic code into a clean modular architecture.

Requirements:
- Identify logical boundaries and separate concerns
- Create focused, single-responsibility modules
- Define clear interfaces between modules
- Preserve all existing functionality
- Add proper exports and imports
- Use TypeScript for type safety
- Follow modern project structure patterns

Monolithic code:

[Paste your large file or code block here]

Provide:
1. Suggested file structure
2. Module separation strategy
3. Code for each new module
4. Updated imports/exports
5. Any necessary refactoring notes