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/api/prisma/schema.prisma

@@ -1,6 +1,5 @@
 generator client {
-  provider = "prisma-client"
-  output   = "../generated/prisma"
+  provider = "prisma-client-js"
 }
 
 datasource db {
@@ -40,3 +39,13 @@ model ExperimentalComponent {
   createdAt     DateTime        @default(now())
   updatedAt     DateTime        @updatedAt
 }
+
+model Block {
+  id          String   @id @default(uuid())
+  path        String   @unique
+  name        String
+  version     String
+  isInPreview Boolean  @default(false)
+  updatedAt   DateTime @updatedAt
+  createdAt   DateTime @default(now())
+}