Refactor logging levels and improve mapper registration

- Changed warning logs to debug logs in CivitaiClient and RecipeScanner for better log granularity.
- Updated the mapper registration function name for clarity and adjusted related logging messages.
- Enhanced extension loading process to automatically register mappers from NODE_MAPPERS_EXT, improving modularity and maintainability.

py/services/civitai_client.py

@@ -234,11 +234,9 @@ class CivitaiClient:
             if not self._session:
                 return None
             
-            logger.info(f"Fetching model version info from Civitai for ID: {model_version_id}")
             version_info = await self._session.get(f"{self.base_url}/model-versions/{model_version_id}")
             
             if not version_info or not version_info.json().get('files'):
-                logger.warning(f"No files found in version info for ID: {model_version_id}")
                 return None
             
             # Get hash from the first file
@@ -248,7 +246,6 @@ class CivitaiClient:
                     hash_value = file_info['hashes']['SHA256'].lower()
                     return hash_value
                 
-            logger.warning(f"No SHA256 hash found in version info for ID: {model_version_id}")
             return None
         except Exception as e:
             logger.error(f"Error getting hash from Civitai: {e}")