Add logic to automatically upload an initial `config.csv` to the default S3 bucket during bootstrap. Enhance S3 operator creation by ensuring endpoint formatting, setting default bucket and region, and enabling path style. Improve template upload flow by validating bucket existence and creating it if missing. Also include debug logging for better traceability.
Eliminates the `s3_bucket` field from `AppConfig` and deletes related initialization code in `main.rs`. This simplifies configuration management since S3 bucket handling is no longer required or used in the application.
