Delete the WyreBuyProvider + WyreOrderProviderAdapter source files,
strip imports and call sites from buy/order view models and the
buy webview, force isBitcoinBuyEnabled = false in di.dart, and drop
the three wyreSecretKey/wyreApiKey/wyreAccountId entries from
tool/utils/secret_key.dart.
BuyProviderDescription.wyre (raw: 0) is kept as a no-op legacy entry
so any old Hive-persisted order with that raw value still deserializes
without throwing. Don't wire it back to UI/services.