fix(kit): use relative type import in host-client

The self-referencing `@nuxt/devtools-kit/types` import broke the nightly
release: after the package is renamed, prepack's rebuild can no longer
resolve it to the local source.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Author: antfu

packages/devtools-kit/src/runtime/host-client.ts

@@ -1,5 +1,5 @@
-import type { NuxtDevtoolsHostClient } from '@nuxt/devtools-kit/types'
 import type { Ref } from 'vue'
+import type { NuxtDevtoolsHostClient } from '../types'
 import { shallowRef } from 'vue'
 
 let clientRef: Ref<NuxtDevtoolsHostClient | undefined> | undefined