chore: generate portal-shell and portal-bff apps per ADR-0004 / ADR-0005

Add the @nx/angular, @nx/nest, @nx/vite, @nx/eslint plugins, then
generate the two apps. Adjust the empty-template tsconfig.base.json
to be Angular-compatible (drop project references and customConditions
that the empty-template defaults to but Angular doesn't support; keep
the strict-TS extensions from ADR-0004).

apps/portal-shell (Angular 21):
- standalone APIs, routing, SCSS, esbuild
- vitest-angular as unitTestRunner, playwright for e2e
- strict mode
- tags scope:portal-shell, type:app
- app.config.ts wired with provideZonelessChangeDetection() per
  ADR-0004 (Angular 21 + Nx 22 generates without zone.js by default)

apps/portal-bff (NestJS 11):
- Express adapter (default per ADR-0005)
- Jest as unitTestRunner
- tags scope:portal-bff, type:app
- main.ts wired with a global ValidationPipe configured
  whitelist + forbidNonWhitelisted + transform per ADR-0005
- Phase-2 security additions (helmet, CORS, sessions, CSRF, rate
  limit, auth guards, error filter) deferred to their respective
  ADRs - placeholder comment in main.ts

Workspace dependencies: class-validator + class-transformer added
(required by NestJS ValidationPipe at runtime). Nx-generated
.gitignore additions (.angular, __screenshots__) merged into ours.
.vscode/extensions.json and launch.json added by Nx are kept (do not
override our existing settings.json).

apps/portal-bff/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/portal-bff'),
+    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,
+    }),
+  ],
+};