feat(sprint-5.5): add NestJS API, BlockMetaBar, block components + fix Vercel build

- Add vercel.json to build only apps/web (fix Vercel build failure)
- NestJS API: BlocksModule, BlocksController, BlocksService with Prisma 7
- PostgreSQL migration: Block model (path, version, isInPreview)
- BlockMetaBar component: inline version edit, API fetch with offline fallback
- New block components: CeoBlock, ContactFormsBlock, FooterBlock, NewsBlock, ReviewsBlock
- PreviewClient: fetch isInPreview from API, block visibility toggle
- Pages updated: hero, doctors, ceo, contact-forms, contact, news, reviews
- docker-compose: PostgreSQL on port 5434

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web/app/components/navigation/page.tsx

@@ -1,6 +1,7 @@
 import type { Metadata } from "next";
 import { LlmBlock, LlmSection, LlmTable, LlmRules } from "@/components/llm/LlmBlock";
 import { NavigationBlock, NAV_ITEMS } from "@/components/blocks/NavigationBlock";
+import { BlockMetaBar } from "@/components/ui/BlockMetaBar";
 
 export const metadata: Metadata = {
   title: "Шапка и навигация. Цифровой брендбук Клиники ухо, горло, нос им. проф. Е.Н.Оленевой",
@@ -57,6 +58,7 @@ export default function NavigationPage() {
         <h1 className="text-2xl font-bold mb-2" style={{ color: "var(--bb-text)" }}>
           Шапка и навигация
         </h1>
+        <BlockMetaBar path="/components/navigation" defaultVersion="v1.0" defaultIsInPreview={true} />
         <p className="text-sm" style={{ color: "var(--bb-text-muted)" }}>
           Точное воспроизведение шапки с perm.oclinica.ru/lor. Три зоны: топ-бар, логотип, главное меню.
         </p>