feat: add factory sample machines and robot pricing conversations

src/utils/showroomAnswers.js

@@ -0,0 +1,31 @@
+import { SHOWROOM_CATALOG } from '../constants/showroomCatalog.js';
+
+/** Looks up a display model by its stable identifier.
+ * @param {string} id - Model identifier.
+ * @returns {object|null} Catalog model, or null for unknown identifiers.
+ */
+export function showroomModelById(id) {
+  return SHOWROOM_CATALOG.find((model) => model.id === id) ?? null;
+}
+
+/** Formats a machine purchase price in rial without converting it to game money.
+ * @param {number} price - Full machine price in rial.
+ * @returns {string} Persian rial price.
+ */
+export function formatRial(price) {
+  return `${price.toLocaleString('fa-IR')} ریال`;
+}
+
+/** Builds the robot's deterministic answer from the shared showroom catalog.
+ * @param {{modelId:string,topic:'price'|'features'}} question - Requested model and topic.
+ * @returns {string|null} Robot answer; unknown questions are rejected.
+ */
+export function showroomAnswer({ modelId, topic }) {
+  const model = showroomModelById(modelId);
+  if (!model) return null;
+  if (topic === 'price')
+    return `قیمت ${model.name}، ${formatRial(model.priceNumeric)} است. این قیمت خود دستگاه به ریال است و از بودجهٔ بازی کم نمی‌شود.`;
+  if (topic === 'features')
+    return `${model.name}: ${model.description} امکانات: ${model.highlights.join('، ')}.`;
+  return null;
+}