Centralize configuration into config.yaml

- All settings moved to config.yaml
- configs/load.py reads from config.yaml with env var overrides
- Environment variables still work for backward compatibility
- Added pyyaml to requirements

app/core/lifecycle.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from app.diagnostics.crash_handler import enable_crash_handler
-from configs.default import LOG_DIR
+from configs.load import LOG_DIR
 
 
 def startup() -> None:

app/core/logging.py

@@ -4,7 +4,7 @@ from pathlib import Path
 
 from loguru import logger
 
-from configs.default import LOG_DIR, LOG_RETENTION, LOG_ROTATION
+from configs.load import LOG_DIR, LOG_RETENTION, LOG_ROTATION
 
 
 def setup_logging() -> None: