feat(sprint-5.5): store block metadata (version, changelog) in PostgreSQL

- Prisma schema: added `changelog Json @default("[]")` to Block model
- Migration: 20260324141120_add_changelog_field
- Seed: 8 blocks with actual versions (v1.0–v1.2) and changelog entries
- API: PATCH /blocks/by-path accepts changelog field
- CORS: accept any localhost port (regex pattern)
- BlockChangelog component: renders version history from API or fallback
- BlockMetaBar: loads changelog from API, passes to BlockChangelog
  - Removed "API офлайн" text, replaced with subtle gray dot
  - Added defaultChangelog prop for offline fallback
- Block pages: removed hardcoded changelog JSX, use defaultChangelog prop
- Updated SPRINTS.md with completed tasks

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/api/src/blocks/blocks.controller.ts

@@ -18,7 +18,7 @@ export class BlocksController {
   @Patch('by-path')
   update(
     @Query('path') path: string,
-    @Body() body: { version?: string; isInPreview?: boolean },
+    @Body() body: { version?: string; isInPreview?: boolean; changelog?: object[] },
   ) {
     return this.blocks.update(path, body);
   }

apps/api/src/blocks/blocks.service.ts

@@ -17,7 +17,7 @@ export class BlocksService {
     });
   }
 
-  update(path: string, data: { version?: string; isInPreview?: boolean }) {
+  update(path: string, data: { version?: string; isInPreview?: boolean; changelog?: object[] }) {
     return this.prisma.block.update({ where: { path }, data });
   }
 }

apps/api/src/main.ts

@@ -4,7 +4,7 @@ import { AppModule } from './app.module';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
-  app.enableCors({ origin: 'http://localhost:3001' });
+  app.enableCors({ origin: [/^http:\/\/localhost:\d+$/] });
   await app.listen(process.env.PORT ?? 3000);
 }
 bootstrap();