chore: generate shared and feature libs with module boundaries per ADR-0003

Generate the four phase-4 libraries:

- libs/shared/tokens (project name shared-tokens) - plain TS lib via
  @nx/js:library; will host the a11y design tokens (palette,
  contrast tiers, spacing, motion) once Tailwind lands in phase 5;
  consumable by both apps; tagged scope:shared, type:shared.
- libs/shared/util (shared-util) - plain TS lib for cross-cutting
  utility code; tagged scope:shared, type:shared.
- libs/shared/ui (shared-ui) - Angular standalone library that will
  host the spartan-ng components copy-pasted in phase 5; Angular-only
  so tagged scope:portal-shell, type:shared. unitTestRunner=
  vitest-analog because vitest-angular requires a buildable lib.
- libs/feature/auth (feature-auth) - placeholder Angular standalone
  feature lib to demonstrate the type:feature pattern; tagged
  scope:portal-shell, type:feature.

@nx/enforce-module-boundaries depConstraints replaced (root
eslint.config.mjs) with the rules from ADR-0003:

  scope:portal-shell -> scope:portal-shell, scope:shared
  scope:portal-bff   -> scope:portal-bff,   scope:shared
  scope:shared       -> scope:shared
  type:app           -> type:feature, type:shared
  type:feature       -> type:feature, type:shared
  type:shared        -> type:shared

This forbids portal-shell from importing portal-bff code (and vice
versa) and prevents shared libs from depending on feature libs.

Project names follow the convention of ADR-0003 (feature-<name> /
shared-<scope>) by passing --name explicitly to the generator; the Nx
22 default takes only the last directory segment.

Sanity check: pnpm nx run-many -t lint and -t test pass for the 8
projects (4 apps/e2e + 4 libs).

Side effects from the generators: tsconfig.base.json paths populated
with the lib import aliases; nx.json gains vite/playwright plugin
entries; .gitignore picks up vitest.config.*.timestamp* (Vitest temp
files); package.json gains @analogjs/vitest-angular and related
devDeps; pnpm-lock.yaml regenerated. Two eslint-disable comments in
portal-bff-e2e support files were trimmed by lint --fix - those files
already lint clean without the directive.

libs/shared/util/eslint.config.mjs

@@ -0,0 +1,22 @@
+import baseConfig from '../../../eslint.config.mjs';
+
+export default [
+  ...baseConfig,
+  {
+    files: ['**/*.json'],
+    rules: {
+      '@nx/dependency-checks': [
+        'error',
+        {
+          ignoredFiles: [
+            '{projectRoot}/eslint.config.{js,cjs,mjs,ts,cts,mts}',
+            '{projectRoot}/vite.config.{js,ts,mjs,mts}',
+          ],
+        },
+      ],
+    },
+    languageOptions: {
+      parser: await import('jsonc-eslint-parser'),
+    },
+  },
+];