feat: add product catalog with URL-based category filtering

data/products.ts

@@ -0,0 +1,16 @@
+import type {Locale, Machine, ProductCategory} from '@/types/domain';
+
+export const productCategories: {id: ProductCategory; label: Record<Locale, string>}[] = [
+    {id: 'warm-vending', label: {fa: 'وندینگ گرم', en: 'Warm vending'}},
+];
+
+// Keep the home showcase independent of future catalog additions.
+const featuredIds = ['rm-35', 'rm-48', 'rm-60'];
+
+export function featuredMachines(machines: Machine[]): Machine[] {
+    return featuredIds.flatMap(id => machines.filter(machine => machine.id === id));
+}
+
+export function filterMachines(machines: Machine[], category: string): Machine[] {
+    return category ? machines.filter(machine => machine.category === category) : machines;
+}