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>

website-monitoring-frontend/Dockerfile

@@ -0,0 +1,16 @@
+FROM node:18
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+
+# Disable the oxide engine so it falls back to JS
+ENV TAILWIND_DISABLE_OXIDE=1
+
+RUN npm install
+
+COPY . .
+
+RUN npm run build
+
+CMD ["npm", "run", "start"]