Fix VK connect_url to point to /vk instead of /vk/connect

/vk/connect no longer exists after switching to manual token entry.

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

web/routes/connections.py

@@ -24,7 +24,7 @@ SERVICE_TYPES = [
         "icon": "bi-bag",
         "description": "Подключите аккаунт ВКонтакте для публикации товаров в вашу группу.",
         "configure_url": "/vk",
-        "connect_url": "/vk/connect",
+        "connect_url": "/vk",
     },
 ]