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/package.json

@@ -24,8 +24,11 @@
     "@nestjs/common": "^11.0.1",
     "@nestjs/core": "^11.0.1",
     "@nestjs/platform-express": "^11.0.1",
+    "@prisma/adapter-pg": "^7.5.0",
     "@prisma/client": "^7.5.0",
+    "@types/pg": "^8.20.0",
     "dotenv": "^17.3.1",
+    "pg": "^8.20.0",
     "reflect-metadata": "^0.2.2",
     "rxjs": "^7.8.1"
   },
@@ -52,9 +55,13 @@
     "ts-loader": "^9.5.2",
     "ts-node": "^10.9.2",
     "tsconfig-paths": "^4.2.0",
+    "tsx": "^4.21.0",
     "typescript": "^5.7.3",
     "typescript-eslint": "^8.20.0"
   },
+  "prisma": {
+    "seed": "ts-node prisma/seed.ts"
+  },
   "jest": {
     "moduleFileExtensions": [
       "js",