Fix NumberTagsWebpageListViewModelTest crash when API env vars are set

The mock stored a full URL in displayShopServerPath, which Shop.displayShopServerUrl
concatenates onto baseURL. When NATEMPLATE_API_* vars point baseURL at a port
(http://host:3000), the resulting string becomes an invalid URL and force-unwrap
crashes. Store a path instead.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: dadachi

NativeAppTemplateTests/UI/Shop Settings/NumberTagsWebpageListViewModelTest.swift

@@ -121,7 +121,7 @@ struct NumberTagsWebpageListViewModelTest {
             itemTagsCount: 10,
             scannedItemTagsCount: 5,
             completedItemTagsCount: 3,
-            displayShopServerPath: "https://api.nativeapptemplate.com/display/shops/\(id)?type=server"
+            displayShopServerPath: "/display/shops/\(id)?type=server"
         )
     }
 }