refactor: adapt config

config/engine.yaml

src/aura_engine/app.py

src/aura_engine/base/config.py

src/aura_engine/base/logger.py

src/aura_engine/core/channels.py

src/aura_engine/core/client.py

src/aura_engine/core/mixer.py

src/aura_engine/engine.py

src/aura_engine/events.py

src/aura_engine/plugins/clock.py

src/aura_engine/plugins/monitor.py

src/aura_engine/scheduling/api.py

src/aura_engine/scheduling/programme.py

src/aura_engine/scheduling/scheduler.py

tests/test_config.py

tests/test_logger.py

tests/test_simple_api.py

tests/test_simple_api_cached.py