- Reduce .env.example to only DATABASE_URL
- Simplify backend/config.py to only read database connection
- All other settings now managed via database and Web UI
- Add CLAUDE.md with project architecture and operation modes
- Add backend/README.md with setup and usage instructions
- Add test_backend.py with automated tests for config, database, and queue
- Update requirements.txt with optional dependencies structure
- Update .env.example with all configuration options
- Add backend/config.py with Pydantic settings validation
- Support for standalone, provider, and hybrid operation modes
- Multi-database backend configuration (SQLite/PostgreSQL/MariaDB)
- Environment variable validation with helpful error messages
- Worker and Whisper model configuration
