commands/init_command library

1. ai_translation_generator package
2. documentation
3. commands/init_command.dart

ai_translation_generator package

1. Libraries
2. ai_translation_generator
3. commands/generate_command
4. commands/init_command
5. models/translation_config
6. services/config_service
7. services/gemini_service
8. services/translation_service
9. utils/cli_utils