Refactor API and enhance Angular integration

- Removed `ciTargetName` from `nx.json`.
- Updated `package.json` to include new dependencies: `@types/seedrandom`, `fast-check`, `happy-dom`, and `@nestjs/schedule`.
- Modified `pnpm-lock.yaml` to reflect the addition of new packages and their versions.
- Improved project documentation in `PROJECT_CONTEXT.md` to clarify the use of Zod schemas and Angular framework decisions.
- Introduced new Angular components and patterns in the `.agents/skills/frontend-angular` directory, including examples and reference materials for Angular 21+ features.

apps/overlay/vitest.config.mts

@@ -0,0 +1,21 @@
+import { defineConfig } from 'vitest/config';
+import { nxViteTsPaths } from '@nx/vite/plugins/nx-tsconfig-paths.plugin';
+
+export default defineConfig(() => ({
+  root: __dirname,
+  cacheDir: '../../node_modules/.vite/apps/overlay',
+  plugins: [nxViteTsPaths()],
+  test: {
+    name: 'overlay',
+    watch: false,
+    globals: true,
+    environment: 'happy-dom',
+    setupFiles: ['./src/test-setup.ts'],
+    include: ['{src,tests}/**/*.{test,spec}.{js,mjs,cjs,ts,mts,cts,jsx,tsx}'],
+    reporters: ['default'],
+    coverage: {
+      reportsDirectory: '../../coverage/apps/overlay',
+      provider: 'v8' as const,
+    },
+  },
+}));