Fix API Error before M5

apps/api/prisma/schema.prisma

@@ -476,6 +476,14 @@ model Product {
   metaDescription String? @map("meta_description")
   metadata        Json?
 
+  /// Seeds generated variant SKUs, e.g. "VEL-NOC" -> "VEL-NOC-BLACK-M".
+  ///
+  /// Stored rather than re-derived, because adding a colourway a year later
+  /// must extend the same SKU family. Falling back to the slug produced
+  /// "AO-GIO-CHAY-DEM-NOCTURNE-BLACK-XL" sitting next to "VEL-NOC-BLACK-M" on
+  /// the same product.
+  skuPrefix String? @map("sku_prefix") @db.VarChar(24)
+
   /// ---- Read-model projection, derived from this product's variants --------
   ///
   /// Denormalised deliberately. Sorting a listing by price and rendering a