Implemented LibreChat integration test and documentation. **Changes made:** 1. Created tests/test_librechat_integration.py with 19 tests covering: - TTS integration (standard requests, all voices, HD model, speed control) - STT integration (WAV transcription, WebM transcription, JSON/text formats) - Health check endpoint - Error handling (OpenAI-compatible format) - CORS preflight handling - Conversation mode rapid requests 2. Created docs/librechat-configuration.md with comprehensive documentation: - Quick start guide - LibreChat YAML configuration examples - Docker deployment instructions - Environment variables reference - Troubleshooting section - Full API reference **Key findings:** - Service uses the newer OpenAI voice set: alloy, ash, ballad, coral, echo, sage, shimmer, verse - Older voices (fable, nova, onyx) are NOT supported - documentation updated to reflect this **Verification:** - Ran all integration tests: 19/19 passed - Ran full test suite: 412/412 passed - Merged to main and pushed to remote