feat(F-001): scaffold modular monolith skeleton with boundary checker

- TypeScript + Fastify skeleton under project/ (src/modules, shared, infrastructure, app)
- scripts/check-module-boundaries.mjs enforcing module public-API rules (tested with fixtures)
- GET /health endpoint, error envelope without stack leakage
- specs/F-001-scaffold (SPEC/DESIGN/TASKS/TESTS), spec/tech.md dependency justification
- 30-ticket MercadoDeVida roadmap in backlog/features.json, spec/roadmap.md
- All gates approved: reviewer, security, qa; verify.sh green

project/src/infrastructure/http/server.ts

@@ -0,0 +1,12 @@
+import { buildApp } from '../../app/build-app.js';
+
+const port = Number(process.env.PORT ?? 3000);
+const host = process.env.HOST ?? '0.0.0.0';
+
+try {
+  const app = await buildApp();
+  await app.listen({ port, host });
+} catch (error) {
+  console.error('Failed to start HTTP server', error);
+  process.exit(1);
+}