fix: improve configuration path handling

This change modifies the way configuration paths are handled by creating the XDG configuration directory if it does not exist, ensuring that the application can properly utilize the XDG configuration path.

aicmt/config.py

@@ -49,13 +49,15 @@ def _get_config_paths() -> Optional[str]:
     1. Local configuration (./.aicmtrc)
     2. XDG configuration ($XDG_CONFIG_HOME/aicmt/.aicmtrc or ~/.config/aicmt/.aicmtrc)
     """
-
+    xdg_config_path = _get_xdg_config_home() / "aicmt"
     config_path = [
         Path.cwd() / ".aicmtrc",  # Local config
-        _get_xdg_config_home() / "aicmt" / ".aicmtrc",  # XDG config
+        xdg_config_path / ".aicmtrc",  # XDG config
         Path.home() / ".aicmtrc",  # Legacy global config
     ]
 
+    xdg_config_path.mkdir(parents=True, exist_ok=True)
+
     for path in config_path:
         if path.is_file():
             return path