fix: correct zod import path from 'zod/v4' to 'zod' (#25)

The content.config.ts was importing zod from 'zod/v4' which is not the standard import path. This fixes the import to use the correct 'zod' module path while still properly importing the z validator from a separate statement rather than from @nuxt/content.

Author: amondnet

packages/layer/content.config.ts

@@ -1,7 +1,7 @@
-import { defineCollection, defineContentConfig, z } from '@nuxt/content'
+import { defineCollection, defineContentConfig } from '@nuxt/content'
 import { useNuxt } from '@nuxt/kit'
 import { joinURL } from 'ufo'
-
+import { z } from 'zod'
 const { options } = useNuxt()
 const cwd = joinURL(options.rootDir, 'content')