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/analytics.ts

@@ -0,0 +1,10 @@
+import { atom } from 'nanostores'
+import { createFetcherStore } from './fetcher'
+import type { AnalyticsSummary } from '../types'
+
+export const $days = atom(30)
+
+export const $analytics = createFetcherStore<AnalyticsSummary>([
+  '/api/studio/analytics?days=',
+  $days,
+])