Marketplace Provider Wiring

marketplaceServiceProvider provides a singleton MarketplaceService; marketplaceControllerProvider provides the Notifier. ProductListState is the consumed value.

1. Controller.build() does ref.watch(marketplaceServiceProvider) — if you override the service provider in tests, the controller picks it up.
2. No autoDispose — state survives screen pops so the user returns to their scroll position + filters.

• Switching to autoDispose would lose pagination on a back-and-forth — current behavior is intentional.
• Service is reconstructed on every provider rebuild because the constructor is a plain `MarketplaceService()` — harmless since Dio is a singleton.

• lib/src/features/shared/marketplace/controllers/marketplace_controller.dart:8 // marketplaceServiceProvider
• lib/src/features/shared/marketplace/controllers/marketplace_controller.dart:427 // marketplaceControllerProvider

Tests that swap the service must do so via ProviderScope override; instantiating MarketplaceController directly bypasses Riverpod and is brittle.