feat: initialize monorepo with full dev team best practices

- Unified monorepo with backend (Express), frontend (Next.js), and devops
- Backend: ESLint, Prettier, Jest tests (3 passing), health endpoint, .env.example
- Frontend: Fixed build errors, fixed all lint errors (0 remaining), tests passing
- DevOps: Docker Compose with PostgreSQL, backend, frontend + healthchecks
- CI/CD: 3 GitHub Actions workflows (backend, frontend, docker integration)
- DX: Husky pre-commit hooks with smart change detection
- Docs: Root README with architecture, CONTRIBUTING.md, PR template

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/workflows/docker.yml

@@ -0,0 +1,31 @@
+name: Docker Integration
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  docker-build:
+    name: Docker Compose Build
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Build all services
+        run: docker compose -f website-monitoring-devops/docker-compose.yml build
+
+      - name: Start services
+        run: |
+          docker compose -f website-monitoring-devops/docker-compose.yml up -d db backend
+          sleep 15
+
+      - name: Verify backend health
+        run: |
+          docker compose -f website-monitoring-devops/docker-compose.yml exec -T backend curl -f http://localhost:5000/health || exit 1
+
+      - name: Cleanup
+        if: always()
+        run: docker compose -f website-monitoring-devops/docker-compose.yml down -v