refactor: move studio to frontends workspace

- Move studio from root to frontends/studio/
- Add owner-tools frontend for live blog admin UI
- Add shared ui component library
- Set up npm workspaces for frontends
- Add enhanced code block extension for editor

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontends/studio/src/stores/apiKeys.ts

@@ -0,0 +1,34 @@
+import { atom } from 'nanostores'
+import { createFetcherStore, createMutatorStore, invalidateKeys } from './fetcher'
+import type { APIKey } from '../types'
+
+export const $apiKeys = createFetcherStore<APIKey[]>(['/api/studio/api-keys'])
+
+export const $creating = atom(false)
+export const $newKey = atom<string | null>(null)
+
+export async function createAPIKey(name: string): Promise<APIKey> {
+  $creating.set(true)
+  try {
+    const res = await fetch('/api/studio/api-keys', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ name }),
+    })
+    if (!res.ok) throw new Error('Failed to create API key')
+    const key = await res.json()
+    $newKey.set(key.key)
+    invalidateKeys('/api/studio/api-keys')
+    return key
+  } finally {
+    $creating.set(false)
+  }
+}
+
+export const $deleteAPIKey = createMutatorStore<string>(
+  async ({ data: key, invalidate }) => {
+    const res = await fetch(`/api/studio/api-keys/${key}`, { method: 'DELETE' })
+    if (!res.ok) throw new Error('Failed to delete API key')
+    invalidate('/api/studio/api-keys')
+  }
+)