Fix: Update all Product references from showOnProducts to showAsReadyMade

- Updated src/app/page.tsx to use showAsReadyMade for ready-made products
- Updated src/app/products/page.tsx to use showAsReadyMade for product filtering
- Updated src/app/products/[slug]/page.tsx to check showAsReadyMade
- Category model retains showOnProducts for catalog filtering

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/app/products/page.tsx

@@ -38,7 +38,7 @@ export default async function ReadyMadeProductsPage({ searchParams }: { searchPa
 
   // Full palette across ready-made products only, for the swatch filter.
   const allProducts = await prisma.product.findMany({
-    where: { showOnProducts: true },
+    where: { showAsReadyMade: true },
     select: { colors: true },
   });
   const paletteSet = new Set<string>();