feat VSN-2079 :refactor ETL to support the new data provider & existing provider at the same time

Refactor ETL service to support multiple data providers:

• Add provider abstraction with BaseProvider class
• Implement AnolocProvider (ZIP/CSV from existing FTP)
• Implement AdanevProvider/GeolocProvider (JSON from new FTP)
• Add /run-etl endpoint with optional provider parameter
• Add data_cleaner_json.py for Geoloc JSON validation
• Update scheduler to process all providers sequentially
• Export invalid plates to Incorrect-data/ folder per provider

Closes VSN-2079