Add Website settings for special-products source.

Businesses can choose product vs store item sourcing, with store as the default when the store module is enabled, and rename the FA special-products section.

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

apps/super-admin/src/services/businessSettingsService.ts

@@ -28,6 +28,9 @@ export interface BusinessSettings {
     orderProcessSteps: Array<{ id: string; label: string; color: string }>
   }
   modules: ModulesSettings
+  website?: {
+    specialProductsSource: 'product' | 'store_item'
+  }
 }
 
 export interface BusinessSettingsResponse {