feat(zero): admin panel section + site /zero page + autogen card

Admin (/admin/zero):
  - new AdminZero with list, status filters, generate button (bucket + allow_dup)
  - per-note actions: approve, edit inline, regenerate (bucket pick), skip,
    'publish now' (approve + scheduled_at=now → runner picks up within 1m)
  - config panel: toggle on/off, generate/approve/publish hour MSK, site URL base
  - new pin 'Зеро' (☕) in AdminNav

Site (zeropost.ru):
  - ZeroBlock — feed of last 3-6 Zero notes, rendered on home next to Серии
  - /zero — full Zero notes list page with character bio block (avatar + bullets)

Autogen integration:
  - ZeroAutogenCard on /admin/autogen — amber card with on/off, hour pickers,
    'generate now' and last-3 preview, link to full section

Plumbing:
  - lib/engine.js: listZeroNotes(), getZeroCharacter()
  - app/admin/api/zero/[...path]/route.js: catch-all proxy with cookie auth

lib/engine.js

@@ -221,6 +221,17 @@ export async function adminRequeueArticle(articleId) {
   return call(`/api/scheduled-posts/schedule-article/${articleId}`, { method: 'POST' });
 }
 
+// ── Zero notes — публичный API для сайта (zeropost.ru/zero) ──────────────
+export async function listZeroNotes({ limit = 12, offset = 0 } = {}) {
+  try { return (await call(`/api/zero/notes?limit=${limit}&offset=${offset}`, { cache: 'no-store' })).items || []; }
+  catch { return []; }
+}
+
+export async function getZeroCharacter() {
+  try { return await call('/api/zero/character', { next: { revalidate: 3600 } }); }
+  catch { return null; }
+}
+
 // Главная страница — собранный набор секций
 export async function getHomeData() {
   return call('/api/articles/home');