Refactor SIGHUP signal handler placement in main.py

- Moved the setup of the SIGHUP signal handler to the main execution block to ensure it is only set when the application is run directly, improving clarity and control over signal handling during application startup.

Author: tansdf

main.py

@@ -46,10 +46,6 @@ def handle_sighup(signum, frame):
         logger.info("SIGHUP signal not available on this platform")
 
 
-# Override uvicorn's signal handlers
-setup_sighup_handler()
-
-
 def validate_config_only():
     """Validate configuration and exit"""
     try:
@@ -248,6 +244,8 @@ def parse_arguments():
     if args.check:
         validate_config_only()
     else:
+        setup_sighup_handler()
+        
         import uvicorn
 
         configure_uvicorn_logging()