Lifts ImportPaymentItems out of GlobalsImporter into a dedicated
PaymentItemImporter driven by Data/seeds/payment-items.json. Wired
into Program.cs and SVSimTestFactory.SeedGlobalsAsync after
PracticeOpponentImporter. Drops the prod-capture file in favor of
the extractor pipeline.
Canonical 4-test suite (basic, idempotent, leave-untouched, skip-zero)
keeps the dict-in-sync upsert pattern Task 2 established.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
