fix: include price multiplier quantity in VK description postfix

"цена за 10 г." instead of "цена за г." when multiplier is set.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/tasks/vk_sync.py

@@ -154,7 +154,11 @@ def _sync_product(
     multiplier = float(sync_config.price_multiplier) if sync_config and sync_config.price_multiplier else 1.0
     price_rubles = _calc_price(product.price) * multiplier
     measure = (product.measure_name or "").strip()
-    desc = f"{product.name} (цена за {measure}.)" if measure else product.name
+    if measure:
+        qty = int(multiplier) if multiplier == int(multiplier) else multiplier
+        desc = f"{product.name} (цена за {qty} {measure}.)"
+    else:
+        desc = product.name
     stock = settings.VK_STOCK_AMOUNT if product.allow_to_sell else 0
     owner_id = f"-{vk_group_id}"
     now = _now()