feat(service): replace show-in-service with hide-for-guest toggle

Mirror the server HideForGuest flag on services: rename the
enable_show_in_service field to hide_for_guest across the form, schema
and generated types, reuse the existing HideForGuest label, and drop the
now-orphaned ShowInService i18n keys. Services are now visible to guests
by default and hidden only when the box is checked, matching servers.

src/locales/zh-CN/translation.json

@@ -83,7 +83,6 @@
     "Confirm": "确认",
     "ConfirmDeletion": "确认删除？",
     "Services": "服务",
-    "ShowInService": "服务中显示",
     "Coverages": {
         "Excludes": "排除特定服务器",
         "Only": "仅特定服务器",