Refactor main.go into focused packages

- Reduced main.go from 961 lines to 89 lines (91% reduction)
- Created new packages for better separation of concerns:
  - cli: Command-line interface setup and configuration
  - processor: Core word processing logic and orchestration
  - batch: Batch file processing functionality
  - translation: Bulgarian to English translation services
  - models: OpenAI model listing functionality
  - phonetic: Phonetic information fetching
- Each package has clear documentation in doc.go files
- Improved testability and maintainability
- All existing functionality preserved
- All tests passing and build successful

0 files changed, 0 insertions, 0 deletions