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/webpack.config.js

@@ -0,0 +1,25 @@
+const { NxAppWebpackPlugin } = require('@nx/webpack/app-plugin');
+const { join } = require('path');
+
+module.exports = {
+  output: {
+    path: join(__dirname, '../../dist/apps/api'),
+    clean: true,
+    ...(process.env.NODE_ENV !== 'production' && {
+      devtoolModuleFilenameTemplate: '[absolute-resource-path]',
+    }),
+  },
+  plugins: [
+    new NxAppWebpackPlugin({
+      target: 'node',
+      compiler: 'tsc',
+      main: './src/main.ts',
+      tsConfig: './tsconfig.app.json',
+      assets: ['./src/assets'],
+      optimization: false,
+      outputHashing: 'none',
+      generatePackageJson: true,
+      sourceMap: true,
+    }),
+  ],
+};