Add website special-products source setting for storefronts.

Let businesses choose product vs store_item sourcing, defaulting from the store module, and expose it on tenant resolve and store-specials.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/tenant/tenant.service.ts

@@ -59,6 +59,7 @@ export class TenantService {
       themeMode: settings.branding.themeMode,
       enabledModules: settings.modules.enabled,
       homeCharts: settings.modules.charts,
+      specialProductsSource: settings.website.specialProductsSource,
       logoUrl: media?.logoMedia?.publicUrl ?? null,
       faviconUrl:
         media?.faviconMedia?.publicUrl ?? media?.logoMedia?.publicUrl ?? null,