- Added usage documentation
- Updated examples folder manual test files
- Renamed special_characters_openai_test
- Renamed DataForSeoApiClient onPage methods
- Added OpenRouter default model to .env
- Added resetProcessed() and clearProcessedTable() to PixabayApiClient
- Added logHttpError() to sendCachedRequest()
- Updated demo-api-server.php to accept 'v1' prefix for status codes