These Keboola-specific data source cards don't belong in the OSS repo.
The catalog now shows only dynamic content: Core Business Data (from
data_description.md) and Business Metrics (from docs/metrics/*.yml).
Also update auto-install.md with Business Metrics documentation,
pipeline diagram, and expanded checklist.
Generator now supports --format {csv,parquet,both}. Parquet mode
uses src.parquet_manager.ParquetManager for snappy compression,
proper column types (DATE, TIMESTAMP, DOUBLE), and metadata.
No more ad-hoc pandas conversion needed on the server.
