Run full Portal BASE ingestion (~300K contracts)

What

Run the Portal BASE adapter across all pages to load the full dataset (~300K+ contracts) into the database.

Why

Right now we only ingest a small batch. The full dataset is required before any statistical flags (Track B) are meaningful.

How

bin/rails runner "DataSource.find_by(adapter_class: 'PublicContracts::PT::PortalBaseClient').tap { |ds| ImportService.new(ds).call }"

Run via Solid Queue for production. Consider batching by page to avoid memory pressure.

Acceptance criteria

• All active DataSource records for Portal BASE are imported.
• Record count in contracts table matches or approximates the source total.
• No duplicate contracts (external_id + country_code uniqueness enforced).
• Tests pass: bundle exec rails test