Optimize deep copy operations in ConfigManager initialization (#654)

* Move deep copy outside validation loop to avoid redundant copies
* Remove redundant deep copy before validation loop

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: gitosaurus <6794831+gitosaurus@users.noreply.github.com>

Author: Copilot

src/hyrax/config_utils.py

@@ -206,6 +206,7 @@ def __init__(
                         f"invalid structure. The configuration will be used as-is. Validation error: {e}"
                     )
 
+        # Update original_config after all validations are complete
         self.original_config = copy.deepcopy(self.config)
 
     @staticmethod