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/pull_request_template.md

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+## Description
+
+<!-- What does this PR do? Link to issue if applicable. -->
+
+Closes #
+
+## Type of Change
+
+- [ ] 🐛 Bug fix (non-breaking change fixing an issue)
+- [ ] ✨ New feature (non-breaking change adding functionality)
+- [ ] 💥 Breaking change (fix or feature causing existing functionality to change)
+- [ ] 📝 Documentation update
+- [ ] 🧹 Chore (dependency update, refactor, etc.)
+
+## Changes Made
+
+<!-- List the key changes -->
+
+-
+-
+-
+
+## Testing
+
+- [ ] Existing tests pass (`npm test`)
+- [ ] New tests added for new functionality
+- [ ] Tested locally with `npm run dev`
+- [ ] Tested with Docker (`npm run docker:up`)
+
+## Checklist
+
+- [ ] My code follows the project code style
+- [ ] I've run `npm run lint` with no errors
+- [ ] I've updated documentation if needed
+- [ ] I've updated `.env.example` if new env vars were added
+- [ ] No secrets or credentials in the code
+
+## Screenshots (if applicable)
+
+<!-- Add screenshots for UI changes -->

.github/workflows/backend.yml

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+name: Backend CI
+
+on:
+  push:
+    branches: [main, develop]
+    paths:
+      - "website-monitoring-backend/**"
+      - ".github/workflows/backend.yml"
+  pull_request:
+    branches: [main]
+    paths:
+      - "website-monitoring-backend/**"
+
+defaults:
+  run:
+    working-directory: website-monitoring-backend
+
+jobs:
+  lint-test-build:
+    name: Lint, Test & Build
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [18, 20]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: npm
+          cache-dependency-path: website-monitoring-backend/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Test
+        run: npm test
+        env:
+          NODE_ENV: test
+
+      - name: Build
+        run: npm run build
+
+      - name: Upload coverage
+        if: matrix.node-version == 20
+        uses: actions/upload-artifact@v4
+        with:
+          name: backend-coverage
+          path: website-monitoring-backend/coverage/
+          retention-days: 7

.github/workflows/docker.yml

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+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

.github/workflows/frontend.yml

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+name: Frontend CI
+
+on:
+  push:
+    branches: [main, develop]
+    paths:
+      - "website-monitoring-frontend/**"
+      - ".github/workflows/frontend.yml"
+  pull_request:
+    branches: [main]
+    paths:
+      - "website-monitoring-frontend/**"
+
+defaults:
+  run:
+    working-directory: website-monitoring-frontend
+
+jobs:
+  lint-test-build:
+    name: Lint, Test & Build
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [18, 20]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: npm
+          cache-dependency-path: website-monitoring-frontend/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Test
+        run: npm test
+        env:
+          NODE_ENV: test
+
+      - name: Build
+        run: npm run build
+        env:
+          NEXT_PUBLIC_SUPABASE_URL: https://placeholder.supabase.co
+          NEXT_PUBLIC_SUPABASE_ANON_KEY: placeholder-key