feat : add setup_logging with hierarchical astrai logger

- setup_logging(): attach handler only to astrai logger, not root
- all astrai.* sub-module loggers inherit automatically
- controlled by ASTR_LOG_LEVEL env var (default INFO)
- called in if __name__ == '__main__' of each CLI script

scripts/tools/server.py

@@ -3,6 +3,7 @@ from pathlib import Path
 import click
 import torch
 
+from astrai import setup_logging
 from astrai.inference import run_server
 
 _DTYPES = ["bfloat16", "float16", "float32"]
@@ -64,4 +65,5 @@ def server_command(
 
 
 if __name__ == "__main__":
+    setup_logging()
     server_command()