chore: initial monorepo scaffold + WDS Phase 1+2 artifacts

- Nx 22.7 monorepo (pnpm 11.1, TypeScript 5.9, Node 24)
- apps/api: NestJS 11 (CJS conforme CODING-RULES.md PGD-DB-004)
- apps/web: React 19 + Vite 8 (ESM)
- libs/shared/api-interface: Zod contract base
- Docker Compose dev: Postgres 18, Valkey 8, MinIO, Mailpit
- WDS artifacts:
  - design-artifacts/A-Product-Brief/ (5 docs canônicos + 16 dialogs)
  - design-artifacts/B-Trigger-Map/ (hub + 4 personas + feature impact)
- Stack canon: STACK.md v2.2 + CODING-RULES.md v2.0 + brand.md
- AGENTS.md + README.md como entrada para devs/agentes

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/api/src/main.ts

@@ -0,0 +1,19 @@
+/**
+ * This is not a production server yet!
+ * This is only a minimal backend to get started.
+ */
+
+import { Logger } from '@nestjs/common';
+import { NestFactory } from '@nestjs/core';
+import { AppModule } from './app/app.module';
+
+async function bootstrap() {
+  const app = await NestFactory.create(AppModule);
+  const globalPrefix = 'api';
+  app.setGlobalPrefix(globalPrefix);
+  const port = process.env.PORT || 3000;
+  await app.listen(port);
+  Logger.log(`🚀 Application is running on: http://localhost:${port}/${globalPrefix}`);
+}
+
+bootstrap();