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.

.agents/skills/frontend-angular/.skillfish.json

@@ -0,0 +1,10 @@
+{
+  "version": 2,
+  "name": "frontend-angular",
+  "owner": "ai-enhanced-engineer",
+  "repo": "aiee-team",
+  "path": "skills/frontend-angular",
+  "branch": "main",
+  "sha": "9742140f3ba1399701796d131407d6f41983074f",
+  "source": "manual"
+}